我正在使用本教程:
http://www.vogella.com/articles/AndroidCamera/article.html
捕获图像并将其保存在SD卡上,但每当我运行此程序时,获取:不幸的是App已停止
错误说:
引起:java.lang.reflect.InvocationTargetException
第39行是:
camera.takePicture(null,null, 新的PhotoHandler(getApplicationContext()));
Logcat输出:
05-29 16:19:38.351: E/AndroidRuntime(767): FATAL EXCEPTION: main
05-29 16:19:38.351: E/AndroidRuntime(767): java.lang.IllegalStateException: Could not execute method of the activity
05-29 16:19:38.351: E/AndroidRuntime(767): at android.view.View$1.onClick(View.java:3599)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.view.View.performClick(View.java:4204)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.view.View$PerformClick.run(View.java:17355)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.os.Handler.handleCallback(Handler.java:725)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.os.Handler.dispatchMessage(Handler.java:92)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.os.Looper.loop(Looper.java:137)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-29 16:19:38.351: E/AndroidRuntime(767): at java.lang.reflect.Method.invokeNative(Native Method)
05-29 16:19:38.351: E/AndroidRuntime(767): at java.lang.reflect.Method.invoke(Method.java:511)
05-29 16:19:38.351: E/AndroidRuntime(767): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-29 16:19:38.351: E/AndroidRuntime(767): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-29 16:19:38.351: E/AndroidRuntime(767): at dalvik.system.NativeStart.main(Native Method)
05-29 16:19:38.351: E/AndroidRuntime(767): Caused by: java.lang.reflect.InvocationTargetException
05-29 16:19:38.351: E/AndroidRuntime(767): at java.lang.reflect.Method.invokeNative(Native Method)
05-29 16:19:38.351: E/AndroidRuntime(767): at java.lang.reflect.Method.invoke(Method.java:511)
05-29 16:19:38.351: E/AndroidRuntime(767): at android.view.View$1.onClick(View.java:3594)
05-29 16:19:38.351: E/AndroidRuntime(767): ... 11 more
05-29 16:19:38.351: E/AndroidRuntime(767): Caused by: java.lang.NullPointerException
05-29 16:19:38.351: E/AndroidRuntime(767): at com.example.cameraapp.MakePhotoActivity.onClick(MakePhotoActivity.java:39)
05-29 16:19:38.351: E/AndroidRuntime(767): ... 14 more
MakePhotoActivity.java:
public class MakePhotoActivity extends Activity {
final static String DEBUG_TAG = "MakePhotoActivity";
private Camera camera;
private int cameraId = 0;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
// do we have a camera?
if (!getPackageManager()
.hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
Toast.makeText(this, "No camera on this device", Toast.LENGTH_LONG)
.show();
} else {
cameraId = findFrontFacingCamera();
if (cameraId < 0) {
Toast.makeText(this, "No front facing camera found.",
Toast.LENGTH_LONG).show();
} else {
camera = Camera.open(cameraId);
}
}
}
public void onClick(View view) {
camera.takePicture(null, null,
new PhotoHandler(getApplicationContext()));
}
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
CameraInfo info = new CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == CameraInfo.CAMERA_FACING_FRONT) {
Log.d(DEBUG_TAG, "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
@Override
protected void onPause() {
if (camera != null) {
camera.release();
camera = null;
}
super.onPause();
}
答案 0 :(得分:5)
要打开Android默认相机,您可以编写简单的2行代码:
Intent intent = new Intent("android.media.action.IMAGE_CAPTURE");
startActivityForResult(intent, 0);
要获取所点击图片的路径,您需要覆盖onActivityResult()
。以下代码可帮助您获取所单击图像的路径:
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (resultCode == Activity.RESULT_OK && requestCode == 0) {
String result = data.toURI();
// ...
}
}
最后,在您的清单文件中,添加&#34; Uses-Permission&#34;对于相机。
<uses-permission android:name="android.permission.CAMERA" />
:更新后的答案:
对于Custom Camra
点击自定义相机的链接:
答案 1 :(得分:2)
通过使用反射调用方法,您已经添加了额外的抽象级别。反射层包装InvocationTargetException
中的任何异常,这使您可以区分实际由反射调用中的失败引起的异常(例如,您的参数列表无效)和内部失败。方法叫做。
只需打开InvocationTargetException
内的原因,您就可以获得原始版本。
答案 2 :(得分:0)
我认为你的问题在这里:
Caused by: java.lang.NullPointerException
05-29 16:19:38.351: E/AndroidRuntime(767): at com.example.cameraapp.MakePhotoActivity.onClick(MakePhotoActivity.java:39)
05-29 16:19:38.351: E/AndroidRuntime(767): ... 14 more
检查出什么问题@ MakePhotoActivity.java,第39行。
答案 3 :(得分:0)
似乎您的camera
对象为空
答案 4 :(得分:-3)
您应该需要AVD上的相机所以编辑您的AVD并在背面和前面添加相机......