我有一个 apk 应用程序，可以通过按钮拍照和拍摄视频。
这是我的 Activity
package com.example.testcamera;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.View;
public class AndroidCameraTestsActivity extends Activity
{
private static final String TAG = AndroidCameraTestsActivity.class.getSimpleName();
private static final int CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE = 100;
private static final int CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE = 200;
public static final int MEDIA_TYPE_IMAGE = 1;
public static final int MEDIA_TYPE_VIDEO = 2;
private Uri fileUri;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
/**
* https://developer.android.com/guide/topics/media/camera.html
* **/
public void onCaptureImage(View v)
{
// give the image a name so we can store it in the phone's default location
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
ContentValues values = new ContentValues();
values.put(MediaStore.Images.Media.TITLE, "IMG_" + timeStamp + ".jpg");
Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
//fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE); // create a file to save the image (this doesn't work at all for images)
fileUri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values); // store content values
intent.putExtra( MediaStore.EXTRA_OUTPUT, fileUri);
// start the image capture Intent
startActivityForResult(intent, CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE);
}
/**
* https://developer.android.com/guide/topics/media/camera.html
* **/
public void onCaptureVideo(View v)
{
//create new Intent
Intent intent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
//fileUri = getOutputMediaFileUri(MEDIA_TYPE_VIDEO); // create a file to save the video in specific folder (this works for video only)
//intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri); // set the image file name
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1); // set the video image quality to high
// start the Video Capture Intent
startActivityForResult(intent, CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == CAPTURE_IMAGE_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
// Originally I was going to iterate through the list of images and grab last added to the MediaStore.
// But this is not necessary if we store the Uri in the image
/*
String[] projection = {MediaStore.Images.ImageColumns._ID};
String sort = MediaStore.Images.ImageColumns._ID + " DESC";
Cursor cursor = this.managedQuery(MediaStore.Images.Thumbnails.EXTERNAL_CONTENT_URI, projection, null, null, sort);
try{
cursor.moveToFirst();
Long id = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Images.ImageColumns._ID));
fileUri = Uri.withAppendedPath(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, String.valueOf(id));
} finally{
cursor.close();
}
*/
if(fileUri != null) {
Log.d(TAG, "Image saved to:\n" + fileUri);
Log.d(TAG, "Image path:\n" + fileUri.getPath());
Log.d(TAG, "Image name:\n" + getName(fileUri)); // use uri.getLastPathSegment() if store in folder
}
} else if (resultCode == RESULT_CANCELED) {
// User cancelled the image capture
} else {
// Image capture failed, advise user
}
}
if (requestCode == CAPTURE_VIDEO_ACTIVITY_REQUEST_CODE) {
if (resultCode == RESULT_OK) {
// Video captured and saved to fileUri specified in the Intent
fileUri = (Uri) data.getData();
if(fileUri != null) {
Log.d(TAG, "Video saved to:\n" + fileUri);
Log.d(TAG, "Video path:\n" + fileUri.getPath());
Log.d(TAG, "Video name:\n" + getName(fileUri)); // use uri.getLastPathSegment() if store in folder
}
} else if (resultCode == RESULT_CANCELED) {
// User cancelled the video capture
} else {
// Video capture failed, advise user
}
}
}
/** Create a file Uri for saving an image or video to specific folder
* https://developer.android.com/guide/topics/media/camera.html#saving-media
* */
private static Uri getOutputMediaFileUri(int type)
{
return Uri.fromFile(getOutputMediaFile(type));
}
/** Create a File for saving an image or video */
private static File getOutputMediaFile(int type)
{
// To be safe, you should check that the SDCard is mounted
if(Environment.getExternalStorageState() != null) {
// this works for Android 2.2 and above
File mediaStorageDir = new File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES), "AndroidCameraTestsFolder");
// This location works best if you want the created images to be shared
// between applications and persist after your app has been uninstalled.
// Create the storage directory if it does not exist
if (! mediaStorageDir.exists()) {
if (! mediaStorageDir.mkdirs()) {
Log.d(TAG, "failed to create directory");
return null;
}
}
// Create a media file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
File mediaFile;
if (type == MEDIA_TYPE_IMAGE){
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"IMG_"+ timeStamp + ".jpg");
} else if(type == MEDIA_TYPE_VIDEO) {
mediaFile = new File(mediaStorageDir.getPath() + File.separator +
"VID_"+ timeStamp + ".mp4");
} else {
return null;
}
return mediaFile;
}
return null;
}
// grab the name of the media from the Uri
protected String getName(Uri uri)
{
String filename = null;
try {
String[] projection = { MediaStore.Images.Media.DISPLAY_NAME };
Cursor cursor = managedQuery(uri, projection, null, null, null);
if(cursor != null && cursor.moveToFirst()){
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DISPLAY_NAME);
filename = cursor.getString(column_index);
} else {
filename = null;
}
} catch (Exception e) {
Log.e(TAG, "Error getting file name: " + e.getMessage());
}
return filename;
}
}
我有第一台设备运行该应用程序，并且有 2 个按钮，拍照 和拍摄视频。
当我在此应用程序中单击拍摄视频时，它运行良好，但当我从按钮中单击拍摄照片时，该应用程序总是“强制关闭”。
这是我的错误日志
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): FATAL EXCEPTION: main
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): java.lang.NullPointerException
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at com.android.camera.Camera.initializeFirstTime(Came ra.java:328)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at com.android.camera.Camera.access$1100(Camera.java: 95)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at com.android.camera.Camera$MainHandler.handleMessag e(Camera.java:282)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at android.os.Handler.dispatchMessage(Handler.java:99 )
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at android.os.Looper.loop(Looper.java:130)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at android.app.ActivityThread.main(ActivityThread.jav a:3683)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at java.lang.reflect.Method.invokeNative(Native Method)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at java.lang.reflect.Method.invoke(Method.java:507)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at com.android.internal.os.ZygoteInit$MethodAndArgsCa ller.run(ZygoteInit.java:839)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at com.android.internal.os.ZygoteInit.main(ZygoteInit .java:597)
11-19 14:43:27.085: ERROR/AndroidRuntime(6903): at dalvik.system.NativeStart.main(Native Method)
11-19 14:43:27.093: WARN/ActivityManager(1308): Force finishing activity com.android.camera/.Camera
11-19 14:43:27.109: WARN/ActivityManager(1308): Force finishing activity makemachine.android.examples/.PhotoCaptureExample
编辑:这是我使用单个应用程序按钮的不同 Activity
package com.example.maincamera;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
public class OpenCameraDemo extends Activity {
private static final int CAMERA_PIC_REQUEST = 2500;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button b = (Button)findViewById(R.id.Button01);
b.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Intent cameraIntent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
startActivityForResult(cameraIntent, CAMERA_PIC_REQUEST);
}
});
}
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == CAMERA_PIC_REQUEST) {
Bitmap image = (Bitmap) data.getExtras().get("data");
ImageView imageview = (ImageView) findViewById(R.id.ImageView01);
imageview.setImageBitmap(image);
}
}
}
这个应用程序仍然错误，我已经尝试了很多应用程序。在 google 中搜索。错误仍然与我的 logcat 错误相同
当我尝试在其他设备上运行它时，这个应用程序运行良好。
如何解决这个问题，以便我可以在我的第一台设备上运行并拍照？
BR。
亚历克斯
最佳答案
崩溃发生在设备的相机应用程序内部，而不是您自己的应用程序。不幸的是，由于该设备上的相机应用程序可能是 AOSP 中实际应用程序的高度定制变体，因此尚不完全清楚故障是什么，但 here is a link to the source file在发生异常的 AOSP 2.3.7 源代码树中。行号与任何感兴趣的内容都不完全匹配，这告诉我您的特定设备上的应用程序至少已经过一些自定义。
initializeFirstTime() 方法中发生异常、调用方法的任何对象都可能是问题的根源，但这些都与 Intent 您的请求传入的参数，因此您可以采取很多措施来使其正常运行，这是值得怀疑的。
因此，您可能会更幸运地在自己的应用程序中自行实现捕获功能。该设备上的 Android API 可能比其 bundle 的系统应用程序更稳定。 Here is an example了解如何创建自己的相机预览和捕获 Activity 。
关于android - 当我在不同的设备中尝试时，应用程序内的相机强制关闭数据为空，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/13505662/