Android應用開發之視頻播放器

資源：

ImageButton所用圖片4張

1. <string name="app_name">MyVideoPlayer</string>
2. <string name="video_text">視頻文件</string>
3. <string name="notfoundsdcard_error">找不到Sd卡</string>
4. <string name="notfoundfile_error">找不到視頻文件</string>

布局

1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:Android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:background="#FFFFCC"
6. android:orientation="vertical" >
8. <TextView
9. android:layout_width="fill_parent"
10. android:layout_height="wrap_content"
11. android:text="@string/video_text" />
13. <EditText
14. android:id="@+id/videoFileEt"
15. android:layout_width="fill_parent"
16. android:layout_height="wrap_content"
17. android:text="cat.3gp" />
19. <TableLayout
20. android:layout_width="fill_parent"
21. android:layout_height="wrap_content"
22. android:gravity="center"
23. android:stretchColumns="*" >
25. <TableRow >
27. <ImageButton
28. android:id="@+id/playBtn"
29. android:layout_width="wrap_content"
30. android:layout_height="wrap_content"
31. android:src="@drawable/play" />
33. <ImageButton
34. android:id="@+id/pauseBtn"
35. android:layout_width="wrap_content"
36. android:layout_height="wrap_content"
37. android:src="@drawable/pause" />
39. <ImageButton
40. android:id="@+id/resetBtn"
41. android:layout_width="wrap_content"
42. android:layout_height="wrap_content"
43. android:src="@drawable/reset" />
45. <ImageButton
46. android:id="@+id/stopBtn"
47. android:layout_width="wrap_content"
48. android:layout_height="wrap_content"
49. android:src="@drawable/stop" />
50. </TableRow>
51. </TableLayout>
53. <SurfaceView
54. android:id="@+id/surfaceView"
55. android:layout_width="fill_parent"
56. android:layout_height="240dip" />
58. </LinearLayout>

Activity

1. package cn.class3g.videoplayer;
3. import java.io.File;
4. import java.io.IOException;
6. import android.app.Activity;
7. import android.media.AudioManager;
8. import android.media.MediaPlayer;
9. import android.os.Bundle;
10. import android.os.Environment;
11. import android.util.Log;
12. import android.view.SurfaceHolder;
13. import android.view.SurfaceHolder.Callback;
14. import android.view.SurfaceView;
15. import android.view.View;
16. import android.view.View.OnClickListener;
17. import android.widget.EditText;
18. import android.widget.ImageButton;
19. import android.widget.Toast;
21. public class VideoPlayerActivity extends Activity implements OnClickListener {
23. private static final String TAG = "VideoPlayerActivity";
24. private ImageButton playBtn, pauseBtn, resetBtn, stopBtn;
25. private EditText fileEt;
26. private SurfaceView videoSv;
28. private MediaPlayer mediaPlayer;
30. private SurfaceHolder holder;
31. private int position = 0;
32. File videoFile = null;
35. public void onCreate(Bundle savedInstanceState) {
36. super.onCreate(savedInstanceState);
37. setContentView(R.layout.main);
39. findViews();
41. mediaPlayer = new MediaPlayer();
42. }
44. private void findViews() {
45. fileEt = (EditText) this.findViewById(R.id.videoFileEt);
46. playBtn = (ImageButton) this.findViewById(R.id.playBtn);
47. pauseBtn = (ImageButton) this.findViewById(R.id.pauseBtn);
48. resetBtn = (ImageButton) this.findViewById(R.id.resetBtn);
49. stopBtn = (ImageButton) this.findViewById(R.id.stopBtn);
51. playBtn.setOnClickListener(this);
52. pauseBtn.setOnClickListener(this);
53. resetBtn.setOnClickListener(this);
54. stopBtn.setOnClickListener(this);
56. videoSv = (SurfaceView) this.findViewById(R.id.surfaceView);
57. holder = videoSv.getHolder();
59. holder.setFixedSize(176, 144); // 設置分辨率
60. /* 下面設置Surface不維護自己的緩沖區，而是等待屏幕的渲染引擎將內容推送到用戶面前 */
61. holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
62. //holder.addCallback(new SurfaceCallback());
63. }
65. public void onClick(View v) {
67. if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) {
68. String fileName = fileEt.getText().toString().trim();
70. videoFile = new File(
71. Environment.getExternalStorageDirectory(), fileName);
72. if (videoFile.exists()) {
73. try {
74. switch (v.getId()) {
75. case R.id.playBtn:
76. playVideo(videoFile);
77. break;
78. case R.id.pauseBtn:
79. // if(mediaPlayer.isPlaying()){
80. // mediaPlayer.pause();
81. // }else{
82. // mediaPlayer.start();
83. // }
84. if(mediaPlayer.isPlaying()){
85. position = mediaPlayer.getCurrentPosition();
86. mediaPlayer.pause();
87. }
89. break;
90. case R.id.resetBtn:
91. if(mediaPlayer.isPlaying()){
92. mediaPlayer.seekTo(0);
93. }else{
94. playVideo(videoFile);
95. }
96. break;
97. case R.id.stopBtn:
98. if(mediaPlayer.isPlaying()){
99. mediaPlayer.stop();
100. }
101. break;
102. }
103. } catch (Exception e) {
104. Log.e(TAG, e.toString());
105. }
107. } else {
108. showToast(R.string.notfoundfile_error);
109. }
110. } else {
111. showToast(R.string.notfoundsdcard_error);
112. }
113. }
115. private void playVideo(File videoFile) throws IOException {
116. mediaPlayer.reset();
117. mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
118. mediaPlayer.setDataSource(videoFile.getAbsolutePath());
119. mediaPlayer.setDisplay(holder);
120. mediaPlayer.prepare();
121. mediaPlayer.start();
122. }
124. private void showToast(int resId) {
125. Toast.makeText(this, resId, 1).show();
126. }
127. }