Android播放音乐

jopen 7年前

mainActivity如下:

    package cn.com;        import android.media.MediaPlayer;        import android.media.MediaPlayer.OnCompletionListener;        import android.media.MediaPlayer.OnErrorListener;        import android.os.Bundle;        import android.view.View;        import android.view.View.OnClickListener;        import android.widget.ImageView;        import android.widget.TextView;        import android.app.Activity;        /**        * 重要错误总结:        * Eclipse报错prepareAsync called in state 8        * 原因:        * 在initView()方法中:        * mMediaPlayer=MediaPlayer.create(MainActivity.this, R.raw.big);        * 为此mMediaPlayer设置了要播放的资源        * 但是在点击stop按钮以后,执行了mMediaPlayer.release();        * 这样的话就释放了资源.所以报错        * 解决办法:        * 在每次点击play的时候,都执行MediaPlayer.create()        * 注意:        * 可以在每次点击暂停的时候保存现在播放的位置即:        * position=mMediaPlayer.getCurrentPosition();        * 然后在每次播放的时候        * mMediaPlayer.seekTo(position);        * 这样就会从暂停处继续播放        *         *        */        public class MainActivity extends Activity {            private TextView mTextView;            private MediaPlayer mMediaPlayer;            private ImageView mPlayerImageView;            private ImageView mPauseImageView;            private ImageView mStopImageView;            private boolean isPause=false;            private boolean isStop=false;            private boolean isStart=false;            private int currentPosition=0;            @Override            public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.main);                initView();            }           private void initView(){               mTextView=(TextView) findViewById(R.id.textView);               mPlayerImageView=(ImageView) findViewById(R.id.playerImageButton);               mPlayerImageView.setOnClickListener(new ButtonOnClickListener());               mPauseImageView=(ImageView) findViewById(R.id.pauseImageButton);               mPauseImageView.setOnClickListener(new ButtonOnClickListener());               mStopImageView=(ImageView) findViewById(R.id.stopImageButton);               mStopImageView.setOnClickListener(new ButtonOnClickListener());               mMediaPlayer=new MediaPlayer();              // mMediaPlayer=MediaPlayer.create(MainActivity.this, R.raw.big);               mMediaPlayer.setOnCompletionListener(new OnCompletionListener() {                public void onCompletion(MediaPlayer mp) {                    mMediaPlayer.release();                    mTextView.setText("音乐播放完毕");                }            });               mMediaPlayer.setOnErrorListener(new OnErrorListener() {                public boolean onError(MediaPlayer mp, int what, int extra) {                    mMediaPlayer.release();                    mTextView.setText("音乐播放错误");                    return false;                }            });           }                       private class ButtonOnClickListener implements OnClickListener {                public void onClick(View v) {                    switch (v.getId()) {                    case R.id.playerImageButton:                        if (!isStart) {                            try {                                 mMediaPlayer=MediaPlayer.create(MainActivity.this, R.raw.big);                                //mMediaPlayer.prepare();                                mMediaPlayer.seekTo(currentPosition);                                mMediaPlayer.start();                                mMediaPlayer.setLooping(true);                                mTextView.setText("开始音乐播放");                                isStart = true;                                isPause = false;                                isStop = false;                            } catch (Exception e) {                            }                        }                                break;                    case R.id.pauseImageButton:                        if (mMediaPlayer != null) {                            if (!isStop) {                                if (!isPause) {                                    mMediaPlayer.pause();                                    mTextView.setText("暂停音乐播放");                                    currentPosition=mMediaPlayer.getCurrentPosition();                                    isPause = true;                                    isStop = false;                                    isStart = false;                                } else {                                    mMediaPlayer.start();                                    mTextView.setText("继续播放音乐");                                    isStart = true;                                    isPause = false;                                    isStop = false;                                }                            }                        }                        break;                    case R.id.stopImageButton:                        if (mMediaPlayer != null) {                            if (isStart) {                                if (!isStop) {                                    mMediaPlayer.stop();                                    mMediaPlayer.release();                                    mTextView.setText("停止音乐播放");                                    currentPosition=0;                                    isStop = true;                                    isPause = false;                                    isStart = false;                                }                            }                        }                        break;                            default:                        break;                    }                }                    }                  }  
main.xml如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"        xmlns:tools="http://schemas.android.com/tools"        android:layout_width="match_parent"        android:layout_height="match_parent" >            <TextView            android:id="@+id/textView"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_centerHorizontal="true"            android:text="测试MediaPlayer"            android:textSize="30sp"        />        <LinearLayout             android:layout_width="wrap_content"            android:layout_height="70dip"            android:orientation="horizontal"            android:layout_below="@id/textView"         >            <ImageView                 android:id="@+id/playerImageButton"                android:layout_width="70dip"                android:layout_height="70dip"                android:src="@drawable/player"             />            <ImageView                 android:id="@+id/pauseImageButton"                android:layout_width="70dip"                android:layout_height="70dip"                android:src="@drawable/pause"                android:layout_marginLeft="20dip"             />            <ImageView                 android:id="@+id/stopImageButton"                android:layout_width="70dip"                android:layout_height="70dip"                android:src="@drawable/stop"                android:layout_marginLeft="20dip"             />        </LinearLayout>        </RelativeLayout>