2019/0611/安卓工作室_(意圖+隱含意圖)資料傳遞+Android生命週期+硬體裝置與應用

#Java前情提要

#意圖 Intent

StartActivity 只能傳過去，要回傳必須用另外一種方法。

StartActivityForResult()取得活動的回傳資料。

##SET_RESULT 是定義好的常數值

##RESULT _OK 是定義好的常數值

##事件處理函式 onAcitvityResult

##startActivityForResult生命週期

Ctrl + o ???

###E:\android\intent03\app\src\main\AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.intent03">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".OpActivity"></activity>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

###"E:\android\intent03\app\src\main\java\com\example\intent03\MainActivity.java

package com.example.intent03;

import android.app.Activity;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static final int SET_RESULT = 1;
    private TextView output;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        output = findViewById(R.id.lblOutput);
    }

    public void button_Click(View v){
        EditText txtOpd1,txtOpd2;
        txtOpd1 = findViewById(R.id.txtOpd1);
        txtOpd2 = findViewById(R.id.txtOpd2);

        Intent intent = new Intent(this,OpActivity.class);
        Bundle bundle = new Bundle();
        bundle.putString("OPERAND01",txtOpd1.getText().toString());
        bundle.putString("OPERAND02",txtOpd2.getText().toString());
        intent.putExtras(bundle);

        startActivityForResult(intent,SET_RESULT);

    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        switch(requestCode){
            case SET_RESULT:
                if(resultCode == RESULT_OK){
                    Bundle bundle = data.getExtras();
                    output.setText("計算結果: "+ bundle.getDouble("RESULT"));
                }
                break;
        }
    }

}

###"E:\android\intent03\app\src\main\java\com\example\intent03\OpActivity.java"

package com.example.intent03;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;
import android.widget.RadioButton;

public class OpActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_op);
    }

    public void button2_Click(View v) {
        int opd1, opd2;
        double result = 0.0;
        RadioButton  rdbAdd,rdbSubtarct , rdbMultiply,rdbDivide;
        CheckBox chkDivide;

        Bundle bundle = this.getIntent().getExtras();
        if (bundle == null)
            return;

        opd1= Integer.parseInt(bundle.getString("OPERAND01"));
        opd2= Integer.parseInt(bundle.getString("OPERAND02"));

        rdbAdd = findViewById(R.id.rdbAdd);
        if (rdbAdd.isChecked()){
            result = opd1 + opd2;
        }
        rdbSubtarct = findViewById(R.id.rdbSubtract);
        if (rdbSubtarct.isChecked()){
            result = opd1 - opd2;
        }
        rdbMultiply = findViewById(R.id.rdbMultiply);
        if (rdbMultiply.isChecked()){
            result = opd1 * opd2;
        }
        rdbDivide = findViewById(R.id.rdbDivide);
        chkDivide = findViewById(R.id.chkDivide);
        if (rdbDivide.isChecked()){
            if (chkDivide.isChecked())
                result = opd1 / opd2;
            else
                result = opd1 / (double)opd2;
        }

        Intent rIntent = new Intent();
        Bundle rbundle = new Bundle();
        rbundle.putDouble("RESULT",result);
        rIntent.putExtras(rbundle);
        setResult(RESULT_OK,rIntent);
        finish();
    }
}

###"E:\android\intent03\app\src\main\res\layout\activity_main.xml"

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    >

    <TextView
        android:text="運算元(一):"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="29dp"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:id="@+id/txtOpd1"
        android:layout_marginLeft="14dp"
        android:layout_marginStart="14dp"
        android:layout_alignBaseline="@+id/textView"
        android:layout_alignBottom="@+id/textView"
        android:layout_toRightOf="@+id/textView"
        android:layout_toEndOf="@+id/textView"
        android:text="100" />

    <TextView
        android:text="運算元(二):"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtOpd1"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="33dp"
        android:id="@+id/textView2" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:ems="10"
        android:layout_below="@+id/txtOpd1"
        android:layout_alignLeft="@+id/txtOpd1"
        android:layout_alignStart="@+id/txtOpd1"
        android:layout_marginTop="22dp"
        android:id="@+id/txtOpd2"
        android:text="50" />

    <Button
        android:text="選擇運算子"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtOpd2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="31dp"
        android:id="@+id/button"
        android:onClick="button_Click" />

    <TextView
        android:text="運算結果"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerVertical="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/lblOutput" />
</RelativeLayout>

###"E:\android\intent03\app\src\main\res\layout\activity_op.xml"

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_op"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    >

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:orientation="horizontal"
        android:id="@+id/rg">

        <RadioButton
            android:text="+"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rdbAdd"
            android:layout_weight="1" />

        <RadioButton
            android:text="-"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rdbSubtract"
            android:layout_weight="1" />

        <RadioButton
            android:text="*"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rdbMultiply"
            android:layout_weight="1" />

        <RadioButton
            android:text="/"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/rdbDivide"
            android:layout_weight="1" />
    </RadioGroup>

    <CheckBox
        android:text="整數除法"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="47dp"
        android:id="@+id/chkDivide"
        android:layout_below="@+id/rg"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:text="計算"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="25dp"
        android:id="@+id/button2"
        android:onClick="button2_Click"
        android:layout_below="@+id/chkDivide"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

</RelativeLayout>

###"E:\android\intent03\app\src\main\res\values\dimens.xml"

<resources>
    <!-- Default screen margins, per the Android Design guidelines. -->
    <dimen name="activity_horizontal_margin">16dp</dimen>
    <dimen name="activity_vertical_margin">16dp</dimen>
</resources>

#隱含意圖 Implicit Intent

Application Installation Failed in Android StudioStack Overflow

###E:\android\Intent04\app\src\main\java\com\example\intent04\MainActivity.java

package com.example.intent04;

import android.content.Intent;
import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void button_Click(View v){
        EditText url = findViewById(R.id.txtURL);
        Intent i = new Intent();
        i.setAction(Intent.ACTION_VIEW);
        i.setData(Uri.parse(url.getText().toString()));
        startActivity(i);
    }

    public void button2_Click(View v){
        Intent i = new Intent(Intent.ACTION_VIEW);
        i.setData(Uri.parse("tel:[phone]"));
        startActivity(i);
    }

    public void button3_Click(View v){
        Intent i = new Intent(Intent.ACTION_VIEW,Uri.parse("geo:25.04775,121.51705"));
        startActivity(i);
    }}

###E:\android\Intent05\app\src\main\res\layout\activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    >

    <TextView
        android:text="URL:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="http://www.google.com"
        android:ems="10"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="17dp"
        android:id="@+id/txtURL" />

    <Button
        android:text="啟動瀏覽器"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtURL"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="28dp"
        android:id="@+id/button"
        android:onClick="button_Click" />

    <Button
        android:text="打電話"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="17dp"
        android:id="@+id/button2"
        android:onClick="button2_Click"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <Button
        android:text="啟動地圖"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="22dp"
        android:id="@+id/button3"
        android:onClick="button3_Click"
        android:layout_below="@+id/button2"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />
    
</RelativeLayout>

##隱含意圖傳遞資料

##隱含意圖資料回傳

###E:\android\Intent05\app\src\main\java\com\example\intent05\MainActivity.java

package com.example.intent05;

import android.app.SearchManager;
import android.content.Intent;
import android.net.Uri;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private static final int GET_CONTACT =1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void button_Click(View view) {
        EditText key = findViewById(R.id.txtKeyword);
        Intent i = new Intent(Intent.ACTION_WEB_SEARCH);
        i.putExtra(SearchManager.QUERY,key.getText().toString());
        startActivity(i);
    }

    public void button1_Click(View view) {
        Intent i = new Intent(Intent.ACTION_PICK);
        i.setType(ContactsContract.Contacts.CONTENT_TYPE);
        startActivityForResult(i,GET_CONTACT);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode == GET_CONTACT) {
            if(resultCode == RESULT_OK){
                String uri = data.getData().toString();
                Toast.makeText(this,uri,Toast.LENGTH_LONG).show();

                Intent i = new Intent(Intent.ACTION_VIEW, Uri.parse(uri));
                startActivity(i);
            }
        }
    }


}

###E:\android\Intent05\app\src\main\res\layout\activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
 >

    <TextView
        android:text="關鍵字:"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/textView" />

    <EditText
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:inputType="textPersonName"
        android:text="Android"
        android:ems="10"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="18dp"
        android:id="@+id/txtKeyword" />

    <Button
        android:text="Web搜尋"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtKeyword"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="24dp"
        android:id="@+id/button"
        android:onClick="button_Click" />

    <Button
        android:text="選取聯絡人"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/button1"
        android:onClick="button1_Click" />
</RelativeLayout>

多了一個+如果有問題的畫

##接著講 邊緣管理 狀態切換

硬體裝置 陀螺儀

電力消耗 優先權運算 資源資訊 更新速度

##手機正轉倒畫面切換 會重新繪圖 執行一次生命週期

###E:\android\Intent05\app\src\main\java\com\example\intent06\MainActivity.java

package com.example.intent06;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Log.d("Intent06","MainActivity:onCreate 方法被執行");
    }

    @Override
    protected void onStart() {
        super.onStart();
        Log.d("Intent06","MainActivity:onStart 方法被執行");
    }

    @Override
    protected void onResume() {
        super.onResume();

        Log.d("Intent06","MainActivity:onResume 方法被執行");
    }

    @Override
    protected void onPause() {
        super.onPause();

        Log.d("Intent06","MainActivity:onPause 方法被執行");
    }

    @Override
    protected void onStop() {
        super.onStop();

        Log.d("Intent06","MainActivity:onStop 方法被執行");
    }


    @Override
    protected void onRestart() {
        super.onRestart();

        Log.d("Intent06","MainActivity:onRestart 方法被執行");
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();

        Log.d("Intent06","MainActivity:onDestroy 方法被執行");
    }
}

https://ithelp.ithome.com.tw/articles/10189220ithelp.ithome.com.tw

#Gps 相機 重力感應器等等…

非同步?

Asynchronywww.google.com

外部裝置請求許可

接著 實作介面的方法

###app\manifests\AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.application2">


    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>


    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MusicActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

###"E:\android\Application2\app\src\main\java\com\example\application2\MusicActivity.java"

package com.example.application2;

import android.media.MediaPlayer;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MusicActivity extends AppCompatActivity implements MediaPlayer.OnCompletionListener{
    private TextView output;
    private MediaPlayer player;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_music);
        output = findViewById(R.id.lblOutput);
        player = MediaPlayer.create(this,R.raw.piano01);
        player.setOnCompletionListener(this);
    }

    @Override
    public void onCompletion(MediaPlayer mp) {
        output.setText("音樂播放完畢....");
        player.seekTo(0);
    }

    public void button_Click(View v){
        if (player != null){
            if(player.isPlaying() != true){
                player.start();
                output.setText("音樂播放中...");
            }
        }
    }

    public void button2_Click(View v){
        output.setText("音樂暫停播放...");
        if (player != null){
            player.pause();
        }
    }

    public void button3_Click(View v){
        output.setText("音樂停止播放...");
        if (player != null){
            player.stop();
            player.prepareAsync();
        }
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        if (player != null){
            player.release();
        }
    }

}

###"E:\android\Application2\app\src\main\res\layout\activity_music.xml"

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
>

    <Button
        android:text="開始/繼續"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:id="@+id/button"
        android:onClick="button_Click" />

    <Button
        android:text="暫停"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/button"
        android:layout_toEndOf="@+id/button"
        android:layout_marginLeft="12dp"
        android:layout_marginStart="12dp"
        android:id="@+id/button2"
        android:onClick="button2_Click" />

    <Button
        android:text="停止"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_toRightOf="@+id/button2"
        android:layout_toEndOf="@+id/button2"
        android:layout_marginLeft="12dp"
        android:layout_marginStart="12dp"
        android:id="@+id/button3"
        android:onClick="button3_Click" />

    <TextView
        android:text="撥放狀態"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/button"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="33dp"
        android:id="@+id/lblOutput" />
</RelativeLayout>

###E:\android\Application2\app\src\main\res\raw\piano01.mp3

##ViedoView、MediaController物件

不同生命週期不同函式進行

例如畫面在背景則執行音樂暫停

切回前景則繼續撥放

桌面上777

SDK物件 OPEN GL ? 才能支援 不然會破圖

E:\android\Skd\emulator\emulator -avd 777 -gpu guest

Host

無法使用要改為 guest

###java\ViedeoActivity.java

package com.example.application2;

import android.net.Uri;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.VideoView;

public class VideoActivity extends AppCompatActivity {
    private VideoView video;
    private String videoFile = "point21";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_video);

        video = findViewById(R.id.videoView);
//        int id = getResources().getIdentifier(videoFile,"raw",this.getPackageName());
        int id = R.raw.point21;
        String path = "android.resource://" + this.getPackageName() + "/" + id;
        video.setVideoURI(Uri.parse(path));
        video.setMediaController(new MediaController(this));
        video.start();
    }

    @Override
    public void onPause(){
        super.onPause();
        video.stopPlayback();
    }
}

###res\layout\activity_video.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="媒體播放器"
        android:id="@+id/textView" />

    <VideoView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="23dp"
        android:id="@+id/videoView" />
</RelativeLayout>

###raw\point21.mp4