006 音量上下键调节app使用

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Activity方法中有个一个onKeyDown方法用于实现监听音量上下键调节。

具体的代码实现：

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    tools:context="com.audio.android.volumekeydown.MainActivity">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="Hello World!"        android:id ="@+id/textView"        android:textSize = "100px"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" /></android.support.constraint.ConstraintLayout>

package com.audio.android.volumekeydown;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.KeyEvent;import android.widget.TextView;public class MainActivity extends AppCompatActivity {    private TextView tv;    int count = 0;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.textView);    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        switch (keyCode) {            case KeyEvent.KEYCODE_VOLUME_DOWN:                tv.setText("volume|||" + count);                count--;                return true;            case KeyEvent.KEYCODE_VOLUME_UP:                tv.setText("volume|||" + count);                count++;                return true;        }        return super.onKeyDown(keyCode, event);    }}

按音量上下键的时候会增加或者减少数值，模拟器上运行的效果

第二个例子调用相关接口设置音量，在第一个例子的基础上进行修改。

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation = "vertical"    tools:context="com.audio.android.volumekeydown.MainActivity">    <TextView        android:id="@+id/textView"        android:layout_width="wrap_content"        android:layout_height="62dp"        android:text="Hello World!"        android:textSize="50px"        app:layout_constraintBottom_toBottomOf="parent"        app:layout_constraintLeft_toLeftOf="parent"        app:layout_constraintRight_toRightOf="parent"        app:layout_constraintTop_toTopOf="parent" />    <Button        android:id="@+id/down"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="down"        tools:layout_editor_absoluteX="158dp"        tools:layout_editor_absoluteY="307dp" />    <Button        android:id="@+id/play"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="play"        tools:layout_editor_absoluteX="278dp"        tools:layout_editor_absoluteY="307dp"        tools:ignore="MissingConstraints" />    <ToggleButton        android:id="@+id/toggleButton"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="toggleButton"        tools:layout_editor_absoluteX="158dp"        tools:layout_editor_absoluteY="409dp" />    <Button        android:id="@+id/up"        android:layout_width="126dp"        android:layout_height="wrap_content"        android:text="up"        tools:layout_editor_absoluteX="52dp"        tools:layout_editor_absoluteY="307dp" /></LinearLayout>

package com.audio.android.volumekeydown;import android.app.Service;import android.media.AudioManager;import android.media.MediaPlayer;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.KeyEvent;import android.view.View;import android.widget.Button;import android.widget.CompoundButton;import android.widget.TextView;import android.widget.ToggleButton;import static android.R.attr.onClick;public class MainActivity extends AppCompatActivity {    private TextView tv;    int count = 0;    AudioManager mAudioManager;    Button play, up, down;    ToggleButton toggleButton;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.textView);        play = (Button) findViewById(R.id.play);        up = (Button) findViewById(R.id.up);        down = (Button) findViewById(R.id.down);        toggleButton = (ToggleButton) findViewById(R.id.toggleButton);        mAudioManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);        play.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                MediaPlayer mediaPlayer = MediaPlayer.create(MainActivity.this, R.raw.lemon_tree);                mediaPlayer.setLooping(true);                mediaPlayer.start();            }        });        up.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,                        AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);            }        });        down.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                mAudioManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,                        AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);            }        });        toggleButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {            @Override            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {                mAudioManager.setStreamMute(AudioManager.STREAM_MUSIC, b);                // mAudioManager.setStreamVolume(AudioManager.STREAM_MUSIC, 0, 0);            }        });    }    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        switch (keyCode) {            case KeyEvent.KEYCODE_VOLUME_DOWN:                tv.setText("volume|||" + count);                count--;                return true;            case KeyEvent.KEYCODE_VOLUME_UP:                tv.setText("volume|||" + count);                count++;                return true;        }        return super.onKeyDown(keyCode, event);    }}

这个例子设计了几个按钮，比如用到了前面的音乐播放，还有声音的大小的调节，还有一个mute/unmute声音的调节，不过setStreamMute已经是depreate.

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