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Android 调用系统Camera 程序照相，获取照片 [复制链接]

听老歌

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发表于 2011-11-30 17:33 |只看该作者 |倒序浏览

Android 调用系统Camera 程序照相，获取照片

下面是我自己整理的源码，网络上好多不能够运行，或者有bug。
我在emulator android 2.1运行良好，源码注释一定程度能够自我解释
强烈推荐配合adb locat Take2:d *:s查看程序运行函数调用情况

对Activity生命周期不是很理解的，请先看我之前的一片文章
http://menuz.iteye.com/blog/1255320

Xml代码

1.<?xml version="1.0" encoding="utf-8"?>
2.<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical" android:layout_width="fill_parent"
4. android:layout_height="fill_parent">
5. <Button android:layout_width="fill_parent"
6. android:layout_height="wrap_content" android:id="@+id/cameraButton"
7. android:text="拍照" />
8.
9. <SurfaceView android:id="@+id/surface_camera"
10. android:layout_width="fill_parent" android:layout_height="10dip"
11. android:layout_weight="1">
12. </SurfaceView>
13.</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<Button android:layout_width="fill_parent"
android:layout_height="wrap_content" android:id="@+id/cameraButton"
android:text="拍照" />
<SurfaceView android:id="@+id/surface_camera"
android:layout_width="fill_parent" android:layout_height="10dip"
android:layout_weight="1">
</SurfaceView>
</LinearLayout>

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Xml代码

1.<?xml version="1.0" encoding="utf-8"?>
2.<manifest xmlns:android="http://schemas.android.com/apk/res/android"
3. package="com.busclient"
4. android:versionCode="1"
5. android:versionName="1.0">
6. <uses-sdk android:minSdkVersion="7" />
7.
8. <uses-permission android:name="android.permission.CAMERA" />
9. <application android:icon="@drawable/icon" android:label="@string/app_name">
10. <uses-library android:name="com.google.android.maps" />
11. <activity android:name=".Take2"
12. android:label="@string/app_name">
13. <intent-filter>
14. <action android:name="android.intent.action.MAIN" />
15. <category android:name="android.intent.category.LAUNCHER" />
16. </intent-filter>
17. </activity>
18. </application>
19. <uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"/>
20. <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
21.</manifest>
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.busclient"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="7" />
<uses-permission android:name="android.permission.CAMERA" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<uses-library android:name="com.google.android.maps" />
<activity android:name=".Take2"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.UPDATE_DEVICE_STATS"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
</manifest>

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Java代码

1.package com.busclient;
2.
3.import java.io.File;
4.import java.io.FileOutputStream;
5.import java.io.IOException;
6.
7.import android.app.Activity;
8.import android.hardware.Camera;
9.import android.hardware.Camera.PictureCallback;
10.import android.os.Bundle;
11.import android.util.Log;
12.import android.view.SurfaceHolder;
13.import android.view.SurfaceView;
14.import android.view.View;
15.import android.view.View.OnClickListener;
16.import android.widget.Button;
17.
18.public class Take2 extends Activity implements SurfaceHolder.Callback {
19. private final static String TAG = "Take2";;
20.
21. private SurfaceView surfaceView;
22.
23. private SurfaceHolder surfaceHolder;
24.
25. private Camera mCam;
26.
27. private boolean hasStartPreview = false;
28.
29. private Button btnTakePicture;
30.
31. // Camera API:
32. // Call release() to release the camera for use by other applications.
33. // Applications should release the camera immediately in onPause() (and
34. // re-open() it in onResume()).
35.
36. @Override
37. protected void onCreate(Bundle savedInstanceState) {
38. super.onCreate(savedInstanceState);
39. setContentView(R.layout.takephoto);
40. Log.d(TAG, "onCreate");
41.
42. // 取得surfaceView的引用,surface在surfaceView中展现
43. // 当surfaceView可见时，surface会被创建，实现surfaceCreated进行特定操作
44. surfaceView = (SurfaceView) findViewById(R.id.surface_camera);
45. btnTakePicture = (Button) findViewById(R.id.cameraButton);
46. // 注册按钮实现拍照
47. btnTakePicture.setOnClickListener(new OnClickListener() {
48.
49. @Override
50. public void onClick(View v) {
51. if (mCam != null) {
52. // 调用mCam进行拍照
53. // param1 Camera.ShutterCallback
54. // param2 Camera.PictureCallback raw 当原始图片数据获得时，会执行PictureCallback
55. // param3 Camera.PictureCallback compressed 当压缩数据获得时，会执行PictureCallback
56. mCam.takePicture(null, null, pictureCallBack);
57. }
58. }
59.
60. });
61.
62. // 要操作surface，只有通过surfaceHolder
63. surfaceHolder = surfaceView.getHolder();
64. surfaceHolder.addCallback(this);
65. surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
66. }
67.
68. private PictureCallback pictureCallBack = new Camera.PictureCallback() {
69.
70. @Override
71. public void onPictureTaken(byte[] data, Camera camera) {
72. if (mCam != null) {
73. if (data != null) {
74. File f = new File("/data/data/com.busclient/picture1.jpg");
75. FileOutputStream fout = null;
76. try {
77. if (!f.exists())
78. f.createNewFile();
79. fout = new FileOutputStream(f);
80. fout.write(data);
81. fout.close();
82. Log.d(TAG, "write success");
83.
84. Thread.sleep(1500);
85. } catch (IOException e) {
86. e.printStackTrace();
87. } catch (InterruptedException e) {
88. e.printStackTrace();
89. } finally {
90. try {
91. if (fout != null) {
92. fout.close();
93. fout = null;
94. }
95. } catch (Exception e) {
96. e.printStackTrace();
97. }
98. }
99. }
100. finish();
101. }
102. }
103. };
104.
105. // surface只能够由一个线程操作，一旦被操作，其他线程就无法操作surface
106. @Override
107. public void surfaceCreated(SurfaceHolder holder) {
108. Log.d(TAG, "surfaceCreated");
109. try {
110. // 必须设置一个初始化的surfaceHolder，若没有surface（由holder操作surface），
111. // 则camera无法启动预览（就是一般打开照相机屏幕能够动态显示场景??描述的不够好）
112. mCam.setPreviewDisplay(surfaceHolder);
113. } catch (IOException e) {
114. Log.d(TAG, "error");
115. mCam.release();
116. mCam = null;
117. }
118. }
119.
120. // 在surfaceCreated后调用，当surface发生变化也会触发该方法，这个方法
121. // 一般至少被调用一次
122. @Override
123. public void surfaceChanged(SurfaceHolder holder, int format, int width,
124. int height) {
125. Log.d(TAG, "surfaceChanged");
126. // 调用startPreview使预览surface可以更新，拍照
127. // 必须启动预览，而startPreview必须在setPreviewDisplay(surfaceHolder)之后
128. if (mCam != null && hasStartPreview == false) {
129.
130. mCam.startPreview();
131. hasStartPreview = true;
132. }
133. }
134.
135. // 析构surface
136. @Override
137. public void surfaceDestroyed(SurfaceHolder holder) {
138. Log.d(TAG, "surfaceDestroyed");
139. // 活都被onPause抢去了
140. }
141.
142. @Override
143. protected void onDestroy() {
144. Log.d(TAG, "onDestroy");
145. super.onDestroy();
146. }
147.
148. // onPause比surfaceDestroyed() 先调用
149. @Override
150. protected void onPause() {
151. Log.d(TAG, "onPause");
152. if (hasStartPreview) {
153. mCam.stopPreview();
154. }
155. mCam.release();
156. mCam = null;
157. hasStartPreview = false;
158. super.onPause();
159. }
160.
161. @Override
162. protected void onRestart() {
163. Log.d(TAG, "onRestart");
164. super.onRestart();
165. }
166.
167. @Override
168. protected void onResume() {
169. Log.d(TAG, "onResume");
170. if (mCam == null)
171. mCam = Camera.open();
172. super.onResume();
173. }
174.
175. @Override
176. protected void onStart() {
177. Log.d(TAG, "onStart");
178. super.onStart();
179. }
180.
181. @Override
182. protected void onStop() {
183. Log.d(TAG, "onStop");
184. super.onStop();
185. }
186.
187.}

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android

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