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我的應用程序具有很多功能，在我的應用程序中添加了相機功能後，如果單擊相機按鈕，我的應用程序意外停止未來。
AndroidManifest.xml單擊相機按鈕，拍攝照片後，應用程序已停止在我的設備中
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Ibetter.tdm"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17"
/>
<uses-permission android:name="android.permission.WAKE_LOCK" ></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO"></uses-permission>
<uses-permission android:name="android.permission.INTERNET" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<application
android:allowBackup="true"
android:icon="@drawable/icon"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.Ibetter.tdm.ProjectListActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.Ibetter.tdm.ActivityTab"
android:label="@string/title_activity_tab_edit"
android:parentActivityName="com.Ibetter.tdm.ProjectListActivity">
</activity>
<activity
android:name="com.Ibetter.tdm.ProjectEditActivity"
android:label="@string/title_activity_project_edit" >
</activity>
<activity
android:name="com.Ibetter.tdm.ReleaseEditActivity"
android:label="@string/title_activity_release_edit" >
</activity>
<activity
android:name="com.Ibetter.tdm.ReleaseListActivity"
android:label="@string/title_activity_release_list" >
</activity>
<activity
android:name="com.Ibetter.tdm.TestEditActivity"
android:label="@string/title_activity_test_edit" >
</activity>
<activity
android:name="com.Ibetter.tdm.TestListActivity"
android:label="@string/title_activity_test_list" >
</activity>
<activity
android:name="com.Ibetter.tdm.ReqListActivity"
android:label="@string/title_activity_req_list" >
</activity>
<activity
android:name="com.Ibetter.tdm.ReqEditActivity"
android:label="@string/title_activity_req_edit" >
</activity>
</application>
</manifest>
這是相機功能的Java文件..
public class ReqEditActivity extends Activity implements OnCompletionListener {
private EditText mTitleText;
private EditText mReqDescText;
private EditText mReqStepsText;
private Button mConfirmButton;
private Long mRowId;
private ProjectsDbAdapter mDbHelper;
private String gprojectname ="";
private String greleasename ="";
private int modifyFormat;
private static final int IMAGE_CAPTURE = 1337;
private Button startBtn;
private Uri imageUri;
private ImageView imageView;
//private static int RESULT_LOAD_IMAGE = 1;
private static final int REQUEST_CODE = 1;
private Bitmap bitmap;
//private ImageView imageView;
private static final int SELECT_PICTURE = 1;
//private String selectedImagePath;
private ImageButton btnPlay;
// Media Player
private MediaPlayer mp;
private String gfilename1 ="";
private static final String AUDIO_RECORDER_FILE_EXT_3GP = ".3gp";
private static final String AUDIO_RECORDER_FILE_EXT_AMR = ".amr";
private static final String AUDIO_RECORDER_FILE_EXT_MP4 = ".mp4";
private static final String REQAUDIO_RECORDER_FOLDER = "ReqAudioRecorder";
private MediaRecorder recorder = null;
public static int currentFormat = 0;
private int output_formats[] = { MediaRecorder.OutputFormat.MPEG_4, MediaRecorder.OutputFormat.THREE_GPP, MediaRecorder.OutputFormat.AMR_NB};
private String file_exts[] = { AUDIO_RECORDER_FILE_EXT_MP4, AUDIO_RECORDER_FILE_EXT_3GP, AUDIO_RECORDER_FILE_EXT_AMR };
protected static final int RESULT_SPEECH_DESC = 1;
protected static final int RESULT_SPEECH_STEPS = 2;
private ImageButton btnSpeakdesc;
private ImageButton btnSpeaksteps;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new ProjectsDbAdapter(this);
setContentView(R.layout.activity_req_edit);
mTitleText = (EditText) findViewById(R.id.title);
mReqDescText = (EditText) findViewById(R.id.body);
mReqStepsText = (EditText) findViewById(R.id.Steps);
mConfirmButton = (Button) findViewById(R.id.confirm);
Bundle extras = getIntent().getExtras();
gprojectname = extras.getString("project");
greleasename = extras.getString("release");
startBtn = (Button) findViewById(R.id.startBtn);
startBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
try {
startCamera();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
//retrieve a reference to the ImageView
//ImageView picView = (ImageView)findViewById(R.id.picture);
//Bitmap thePic = null;
//display the returned cropped image
// picView.setImageBitmap(thePic);
mRowId = savedInstanceState != null ? savedInstanceState.getLong(ProjectsDbAdapter.KEY_ROWID_REQS): null;
registerButtonListenersAndSetDefaultText();
//for speech to text and recording purpose
setButtonHandlers();
enableButtons(false);
btnSpeakdesc = (ImageButton) findViewById(R.id.btnSpeakdesc);
btnSpeaksteps = (ImageButton) findViewById(R.id.btnSpeaksteps);
// All player buttons
btnPlay = (ImageButton) findViewById(R.id.btnPlay);
// Mediaplayer
mp = new MediaPlayer();
btnSpeakdesc.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
Intent intent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US");
try {
startActivityForResult(intent, RESULT_SPEECH_DESC);
mReqDescText.setText("");
}
catch (ActivityNotFoundException a)
{
Toast t = Toast.makeText(getApplicationContext(),
"Opps! Your device doesn't support Speech to Text",
Toast.LENGTH_SHORT);
t.show();
}
}
});
btnSpeaksteps.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View v) {
Intent intent = new Intent(
RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL, "en-US");
try {
startActivityForResult(intent, RESULT_SPEECH_STEPS);
mReqStepsText.setText("");
}
catch (ActivityNotFoundException a)
{
Toast t = Toast.makeText(getApplicationContext(),
"Opps! Your device doesn't support Speech to Text",
Toast.LENGTH_SHORT);
t.show();
}
}
});
/**
* Play button click event
* plays a song and changes button to pause image
* pauses a song and changes button to play image
* */
btnPlay.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View arg0)
{
// check for already playing
if(mp.isPlaying()){
if(mp!=null){
mp.pause();
// Changing button image to play button
btnPlay.setImageResource(R.drawable.btn_play);
}
}else{
// Resume song
if(mp!=null){
mp.start();
// Changing button image to pause button
btnPlay.setImageResource(R.drawable.btn_pause);
// play selected song
Cursor filename = mDbHelper.fetchreqsFileName(mRowId);
startManagingCursor(filename);
gfilename1 = filename.getString(filename.getColumnIndexOrThrow(ProjectsDbAdapter.KEY_REQFILENAME));
playSong(gfilename1);
}
}
}
});
}
public void startCamera()
throws IOException {
Log.d("QAM_CAMERA", "Starting camera on the phone...");
File photosDir = new File(Environment.getExternalStorageDirectory(), "photos");
if (!photosDir.isDirectory()) {
photosDir.mkdirs();
}
File imageFile = File.createTempFile("testphoto", ".jpg", photosDir);
Intent intent = new Intent(android.provider.MediaStore.ACTION_IMAGE_CAPTURE);
intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(imageFile));
intent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, 1);
startActivityForResult(intent, IMAGE_CAPTURE);
}
private void setRowIdFromIntent() {
if (mRowId == null || mRowId.longValue() == 0) {
Bundle extras = getIntent().getExtras();
gprojectname = extras.getString("project");
greleasename = extras.getString("release");
mRowId = extras != null ? extras.getLong(ProjectsDbAdapter.KEY_ROWID_REQS) : null;
}
}
@Override
protected void onPause() {
super.onPause();
mDbHelper.close();
}
@Override
protected void onResume() {
super.onResume();
mDbHelper.open();
setRowIdFromIntent();
populateFields();
}
private void registerButtonListenersAndSetDefaultText() {
mConfirmButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
saveState();
setResult(RESULT_OK);
Toast.makeText(ReqEditActivity.this, getString(R.string.task_saved_message), Toast.LENGTH_SHORT).show();
finish();
}
});
}
private void populateFields() {
try
{
// Only populate the text boxes and change the calendar date
// if the row is not null from the database.
if (mRowId != null)
{
Cursor reqs = mDbHelper.fetchreqs(mRowId);
startManagingCursor(reqs);
mTitleText.setText(reqs.getString(
reqs.getColumnIndexOrThrow(ProjectsDbAdapter.KEY_TITLE)));
mReqDescText.setText(reqs.getString(
reqs.getColumnIndexOrThrow(ProjectsDbAdapter.KEY_DESC)));
mReqStepsText.setText(reqs.getString(
reqs.getColumnIndexOrThrow(ProjectsDbAdapter.KEY_BODY)));
reqs.close();
} else {
// This is a new task - add defaults from preferences if set.
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(this);
String defaultTitleKey = getString(R.string.pref_task_title_key);
String defaultTitle = prefs.getString(defaultTitleKey, null);
//if(defaultTitle != null)
mTitleText.setText("Edit REQS");
}
}
catch (Exception ex)
{}
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(ProjectsDbAdapter.KEY_ROWID_REQS, mRowId);
}
private void saveState() {
String title = mTitleText.getText().toString();
String Desc = mReqDescText.getText().toString();
String Body = mReqStepsText.getText().toString();
if (mRowId == null || mRowId.longValue() == 0)
{
long id = mDbHelper.createreqs(title, Desc, Body,gprojectname,greleasename);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updatereqs(mRowId, title, Desc, Body);
}
}
//for speech to text and audio recording
public View.OnClickListener btnClick = new View.OnClickListener()
{
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.btnStart:{
AppLog.logString("Start Recording");
enableButtons(true);
startRecording();
break;
}
case R.id.btnStop:{
AppLog.logString("Start Recording");
enableButtons(false);
stopRecording();
break;
}
}
}
};
public MediaRecorder.OnErrorListener errorListener = new MediaRecorder.OnErrorListener() {
@Override
public void onError(MediaRecorder mr, int what, int extra) {
AppLog.logString("Error: " + what + ", " + extra);
}
};
public MediaRecorder.OnInfoListener infoListener = new MediaRecorder.OnInfoListener() {
@Override
public void onInfo(MediaRecorder mr, int what, int extra) {
AppLog.logString("Warning: " + what + ", " + extra);
}
};
public void setButtonHandlers() {
((Button)findViewById(R.id.btnStart)).setOnClickListener(btnClick);
((Button)findViewById(R.id.btnStop)).setOnClickListener(btnClick);
}
public void enableButton(int id,boolean isEnable){
((Button)findViewById(id)).setEnabled(isEnable);
}
public void enableButtons(boolean isRecording) {
enableButton(R.id.btnStart,!isRecording);
enableButton(R.id.btnStop,isRecording);
}
/*private void setStopButtonCaption(){
((Button)findViewById(R.id.btnStop)).setText(getString(R.string.audio_format) + " (" + file_exts[currentFormat] + ")");
}*/
@SuppressLint("NewApi")
private void startRecording(){
//displayFormatDialog();
AlertDialog.Builder builder = new AlertDialog.Builder(this);
String formats[] = {"MPEG 4", "3GPP", "AMR"};
builder.setTitle(getString(R.string.choose_format_title))
.setSingleChoiceItems(formats, currentFormat, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
currentFormat = which;
dialog.dismiss();
recorder = new MediaRecorder();
recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
recorder.setOutputFormat(output_formats[currentFormat]);
recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
recorder.setOutputFile(getFilename());
//recorder.setOnErrorListener(errorListener);
//recorder.setOnInfoListener(infoListener);
try {
recorder.prepare();
recorder.start();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}).show();
}
private void stopRecording(){
if(null != recorder)
{
mDbHelper.updatereqsFileName(mRowId, gfilename1);
recorder.stop();
recorder.reset();
recorder.release();
recorder = null;
}
}
/*private int displayFormatDialog(){
AlertDialog.Builder builder = new AlertDialog.Builder(this);
String formats[] = {"MPEG 4", "3GPP", "AMR"};
builder.setTitle(getString(R.string.choose_format_title))
.setSingleChoiceItems(formats, currentFormat, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
currentFormat = which;
dialog.dismiss();
}
}).show();
return currentFormat;
}*/
public String getFilename(){
String filepath = Environment.getExternalStorageDirectory().getPath();
File file = new File(filepath,REQAUDIO_RECORDER_FOLDER);
if(!file.exists()){
file.mkdirs();
}
gfilename1 = (file.getAbsolutePath() + "/" + System.currentTimeMillis() + file_exts[currentFormat]);
return (gfilename1);
}
/**
* Receiving song index from playlist view
* and play the song
* */
@Override
protected void onActivityResult(int requestCode,
int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
//conversion and audio record
switch (requestCode)
{
case RESULT_SPEECH_DESC: {
if (resultCode == RESULT_OK && null != data) {
ArrayList<String> text = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
mReqDescText.setText(text.get(0));
}
break;
}
case RESULT_SPEECH_STEPS: {
if (resultCode == RESULT_OK && null != data) {
ArrayList<String> text = data
.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
mReqStepsText.setText(text.get(0));
}
break;
}
}
if (requestCode == IMAGE_CAPTURE) {
if (resultCode == RESULT_OK){
Log.d("ANDRO_CAMERA","Picture taken!!!");
imageView.setImageURI(imageUri);
}
}
}
@Override
public void onCompletion (MediaPlayer arg0)
{
}
/**
* Function to play a song
* @param songIndex - index of song
* */
public void playSong(String gfilename1){
// Play song
try
{
mp.reset();
mp.setDataSource(gfilename1);
mp.prepare();
mp.start();
// Changing Button Image to pause image
btnPlay.setImageResource(R.drawable.btn_pause);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
@Override
public void onDestroy(){
super.onDestroy();
mp.release();
}
public String getPath(Uri uri) {
String[] projection = { MediaStore.Images.Media.DATA };
Cursor cursor = managedQuery(uri, projection, null, null, null);
int column_index = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
cursor.moveToFirst();
return cursor.getString(column_index);
}
}
加入拍照功能之後，這些錯誤顯示，你可以看看我的Java和清單文件，是任何版本問題在後面？
logcat的錯誤
03-16 04:48:06.826: E/AndroidRuntime(1239): FATAL EXCEPTION: main
03-16 04:48:06.826: E/AndroidRuntime(1239): java.lang.RuntimeException: Unable to instantiate application android.app.Application: java.lang.NullPointerException
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.LoadedApk.makeApplication(LoadedApk.java:504)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4364)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.ActivityThread.access$1300(ActivityThread.java:141)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1294)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.os.Handler.dispatchMessage(Handler.java:99)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.os.Looper.loop(Looper.java:137)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.ActivityThread.main(ActivityThread.java:5039)
03-16 04:48:06.826: E/AndroidRuntime(1239): at java.lang.reflect.Method.invokeNative(Native Method)
03-16 04:48:06.826: E/AndroidRuntime(1239): at java.lang.reflect.Method.invoke(Method.java:511)
03-16 04:48:06.826: E/AndroidRuntime(1239): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
03-16 04:48:06.826: E/AndroidRuntime(1239): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
03-16 04:48:06.826: E/AndroidRuntime(1239): at dalvik.system.NativeStart.main(Native Method)
03-16 04:48:06.826: E/AndroidRuntime(1239): Caused by: java.lang.NullPointerException
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.LoadedApk.initializeJavaContextClassLoader(LoadedApk.java:379)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.LoadedApk.getClassLoader(LoadedApk.java:322)
03-16 04:48:06.826: E/AndroidRuntime(1239): at android.app.LoadedApk.makeApplication(LoadedApk.java:496)
03-16 04:48:06.826: E/AndroidRuntime(1239): ... 11 more
除了最重要的部分，您似乎已經逐字添加了所有內容。 logcat堆棧跟蹤！如果我可以添加，也會格式錯誤。請僅將您的代碼修剪至相關部分。 – 2013-03-16 04:29:30
雅我把logcar錯誤 – kkarthickk 2013-03-16 04:32:55
你可以發佈你從哪裏調用這個活動的代碼片段。 – 2013-03-16 04:59:57