13_拍照、录像和音频
16lz
2021-01-26
Goolgle 从Android OS 2.0版本开始提供照相API功能，可以开发控制照相功能，更在Android OS 2.3版本支持多个相机功能，让相机应用程序可以选择和配置相机。简要介绍拍照、录像和音频。
1. 拍照
1 package cn.eoe.system.camera; 2 3 import android.app.Activity; 4 import android.content.Intent; 5 import android.graphics.Bitmap; 6 import android.os.Bundle; 7 import android.provider.MediaStore; 8 import android.view.View; 9 import android.view.View.OnClickListener;10 import android.widget.Button;11 import android.widget.ImageView;12 13 public class Main extends Activity implements OnClickListener {14 private ImageView imageView;15 16 @Override17 public void onCreate(Bundle savedInstanceState) {18 super.onCreate(savedInstanceState);19 setContentView(R.layout.main);20 21 Button btnTakePicture = (Button) findViewById(R.id.btnTakePicture);22 btnTakePicture.setOnClickListener(this);23 24 imageView = (ImageView) findViewById(R.id.imageview);25 26 }27 28 protected void onActivityResult(int requestCode, int resultCode, Intent data) {29 if (requestCode == 1) {30 // 点了拍照按钮，是一个小的对号。31 if (resultCode == Activity.RESULT_OK) {32 // 获得图像的字节流33 Bitmap cameraBitmap = (Bitmap) data.getExtras().get("data");34 imageView.setImageBitmap(cameraBitmap);35 36 }37 }38 }39 40 // 窗口返回，所以使用startActivityForResult41 public void onClick(View view) {42 Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);43 startActivityForResult(intent, 1);44 }45 46 }Main
2. 录像
1 package cn.eoe.record.video; 2 3 import android.app.Activity; 4 import android.content.Intent; 5 import android.database.Cursor; 6 import android.net.Uri; 7 import android.os.Bundle; 8 import android.provider.MediaStore; 9 import android.view.View;10 import android.view.View.OnClickListener;11 import android.widget.Button;12 import android.widget.MediaController;13 import android.widget.VideoView;14 15 public class Main extends Activity implements OnClickListener {16 public VideoView videoView;17 18 @Override19 public void onCreate(Bundle savedInstanceState) {20 super.onCreate(savedInstanceState);21 setContentView(R.layout.main);22 Button btnTakePicture = (Button) findViewById(R.id.btnTakePicture);23 btnTakePicture.setOnClickListener(this);24 25 videoView = (VideoView) findViewById(R.id.videoview);26 27 }28 29 protected void onActivityResult(int requestCode, int resultCode, Intent data) {30 if (requestCode == 1) {31 if (resultCode == Activity.RESULT_OK) {32 // 视频比较大，不可能放在Intent里面。视频的路径存在系统数据库里面，返回了一个URI33 // 通过URI找到视频存放路径34 Uri uri = data.getData();35 Cursor cursor = this.getContentResolver().query(uri, null,36 null, null, null);37 38 if (cursor.moveToFirst()) {39 String videoPath = cursor.getString(cursor40 .getColumnIndex("_data"));41 videoView.setVideoURI(Uri.parse(videoPath));42 videoView.setMediaController(new MediaController(this));43 videoView.start();44 }45 }46 }47 }48 49 public void onClick(View view) {50 Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);51 startActivityForResult(intent, 1);52 53 }54 }Main
3. 音频
1 package cn.eoe.play.music; 2 3 import android.app.Activity; 4 import android.media.MediaPlayer; 5 import android.media.MediaPlayer.OnCompletionListener; 6 import android.os.Bundle; 7 import android.view.View; 8 import android.view.View.OnClickListener; 9 import android.widget.Button;10 11 public class Main extends Activity implements OnClickListener,12 OnCompletionListener {13 private MediaPlayer mediaPlayer;14 private Button btnPause;15 16 @Override17 public void onCreate(Bundle savedInstanceState) {18 super.onCreate(savedInstanceState);19 setContentView(R.layout.main);20 21 Button btnStart1 = (Button) findViewById(R.id.btnStart1);22 Button btnStart2 = (Button) findViewById(R.id.btnStart2);23 24 Button btnStop = (Button) findViewById(R.id.btnStop);25 26 btnPause = (Button) findViewById(R.id.btnPause);27 28 btnStart1.setOnClickListener(this);29 btnStart2.setOnClickListener(this);30 btnStop.setOnClickListener(this);31 btnPause.setOnClickListener(this);32 33 }34 35 public void onCompletion(MediaPlayer mp) {36 mp.release();37 setTitle("资源已经释放");38 39 }40 41 public void onClick(View view) {42 try {43 switch (view.getId()) {44 case R.id.btnStart1: // 播放音频资源45 mediaPlayer = MediaPlayer.create(this, R.raw.music);46 mediaPlayer.setOnCompletionListener(this);47 48 mediaPlayer.start();49 break;50 51 case R.id.btnStart2:// 播放SD卡上的音频文件（/sdcard/music.mp3)52 mediaPlayer = new MediaPlayer();53 mediaPlayer.setDataSource("/sdcard/music.mp3");54 55 mediaPlayer.prepare();56 mediaPlayer.start();57 break;58 59 case R.id.btnStop:60 if (mediaPlayer != null) {61 if (mediaPlayer.isPlaying())62 mediaPlayer.stop();63 }64 break;65 66 case R.id.btnPause:67 if (mediaPlayer != null) {68 if ("播放".equals(btnPause.getText().toString())) {69 mediaPlayer.start();70 btnPause.setText("暂停");71 72 } else if ("暂停".equals(btnPause.getText().toString())) {73 mediaPlayer.pause();74 btnPause.setText("播放");75 }76 }77 break;78 79 default:80 break;81 }82 } catch (Exception e) {83 // TODO: handle exception84 }85 }86 }Main
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