Android Activity編程之視頻播放界面

最近涉及到一個需要Android播放視頻的界面，內容不多，直接上代碼。

先看布局文件act_video_play，裡面有一個VideoView組件：

1. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"

• android:layout_height="fill_parent"
• android:background="#ff000000"
• android:gravity="center" >
• <VideoView
• android:id="@+id/videoView"
• android:layout_width="wrap_content"
• android:layout_height="wrap_content"
• android:layout_gravity="center" />
• </LinearLayout>

再來看activity代碼：

1. package com.example.playmp4;
3. import android.app.Activity;
4. import android.app.Dialog;
5. import android.app.ProgressDialog;
6. import android.content.DialogInterface;
7. import android.content.DialogInterface.OnKeyListener;
8. import android.content.Intent;
9. import android.media.MediaPlayer;
10. import android.media.MediaPlayer.OnCompletionListener;
11. import android.media.MediaPlayer.OnPreparedListener;
12. import android.net.Uri;
13. import android.os.Bundle;
14. import android.os.Environment;
15. import android.util.DisplayMetrics;
16. import android.view.KeyEvent;
17. import android.widget.LinearLayout;
18. import android.widget.LinearLayout.LayoutParams;
19. import android.widget.MediaController;
20. import android.widget.VideoView;
22. public class PlayMP4 extends Activity {
24. private VideoView videoView;
25. private int play_progress;
26. private String video_url;
27. private String progress_Title;
28. private Dialog progress;
30. @Override
31. protected void onCreate(Bundle savedInstanceState) {
32. super.onCreate(savedInstanceState);
33. setContentView(R.layout.act_video_play);
35. Intent intent = getIntent();
36. video_url = intent.getStringExtra("video_url");
37. progress_Title = intent.getStringExtra("title");
39. // for test
40. video_url = Environment.getExternalStorageDirectory().toString()
41. + "/dcim/100MEDIA/VIDEO0002.mp4";
43. if (this.progress_Title == null)
44. this.progress_Title = "Loading";
46. play_progress = intent.getIntExtra("play_progress", 0);
47. videoView = (VideoView) findViewById(R.id.videoView);
48. progress = ProgressDialog.show(this, "loading", progress_Title);
49. progress.setOnKeyListener(new OnKeyListener() {
50. @Override
51. public boolean onKey(DialogInterface dialog, int keyCode,
52. KeyEvent event) {
53. if (keyCode == KeyEvent.KEYCODE_BACK) {
54. dialog.dismiss();
55. PlayMP4.this.finish();
56. }
57. return false;
58. }
59. });
61. videoView.setVideoURI(Uri.parse(video_url));
62. MediaController controller = new MediaController(this);
63. videoView.setMediaController(controller);
64. videoView.requestFocus();
66. videoView.setLayoutParams(new LinearLayout.LayoutParams(
67. LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
69. videoView.setOnPreparedListener(new OnPreparedListener() {
70. @Override
71. public void onPrepared(MediaPlayer mp) {
72. if (progress != null)
73. progress.dismiss();
74. }
75. });
77. videoView.setOnCompletionListener(new OnCompletionListener() {
78. @Override
79. public void onCompletion(MediaPlayer mp) {
80. if (progress != null)
81. progress.dismiss();
82. }
83. });
84. }
86. @Override
87. public boolean onKeyDown(int keyCode, KeyEvent event) {
88. if (keyCode == KeyEvent.KEYCODE_BACK) {
89. Intent intent = new Intent();
90. intent.putExtra("play_progress", videoView.getCurrentPosition());
91. setResult(RESULT_OK, intent);
92. }
93. return super.onKeyDown(keyCode, event);
94. }
96. @Override
97. protected void onResume() {
98. super.onResume();
99. videoView.seekTo(play_progress);
100. videoView.start();
101. }
103. @Override
104. protected void onStop() {
105. super.onStop();
106. if (videoView != null) {
107. videoView.pause();
108. play_progress = videoView.getCurrentPosition();
109. }
110. if (progress != null) {
111. progress.dismiss();
112. }
113. }
114. }

video_url這個就是播放的地址，可以是本地文件地址，也可以是網絡上的鏈接。

play_progress為播放進度。當這個播放界面關閉後，會返回該值給上一級界面。下次再播放同一個視頻時，就可以直接從上一次停止的位置播放。如何處理記錄播放位置，這個就根據應用情況，請自行設計，這裡就不多啰嗦了。

這個就不附工程了，代碼如上。

更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11