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2つのボタンを使用して2つの異なるフラグメントに切り替わります。 1つのフラグメントはカメラビューを持ち、最初はかなり開いていますが、2つ目のフラグメントから同じフラグメントに戻ったときに空白の画面が表示されます。カメラのハードウェアは無料ですが、カメラのプレビューは見られません。私はcamera2 apiを使用していませんが、このバグの解決策が必要です。私は完全なコードと画像を追加しました。 
フラグメントの切り替え中にカメラを操作する方法は？
マニフェスト
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.root.meeransunday" >
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar"
android:screenOrientation="portrait"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<supports-screens android:smallScreens="true"
android:normalScreens="true"
android:largeScreens="true"
android:xlargeScreens="true"
android:anyDensity="true"
android:resizeable="true"/>
</application>
<activity android:name="meeranSunday"
android:configChanges="orientation|keyboardHidden"
/>
<uses-permission android:name="android.permission.SEND_SMS" />
<uses-permission android:name="android.permission.CAMERA">
</uses-permission>
<uses-feature android:name="android.hardware.camera.autofocus" />
<uses-feature android:name="android.hardware.camera" />
</manifest>フラグメントのJavaクラス
public class scan extends Fragment implements ZXingScannerView.ResultHandler {
private ZXingScannerView zXingScannerView;
private SurfaceView mySurfaceView;
private Camera mCamera;
private CameraPreview mPreview;
private String m_Text = "";
private String number = "";
private OnFragmentInteractionListener mListener;
public scan() {}
@Override
public void handleResult(Result rawResult) {
// Do something with the result here
Log.e("handler", rawResult.getText()); // Prints scan results
Log.e("handler", rawResult.getBarcodeFormat().toString()); // Prints the scan format (qrcode)
// show the scanner result into dialog box.
AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setTitle("Scan Result");
builder.setMessage(rawResult.getText());
number = rawResult.getText().substring(rawResult.getText().length() - 13);
//
final EditText input = new EditText(this.getActivity());
// Specify the type of input expected; this, for example, sets the input as a password, and will mask the text
input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
builder.setView(input);
// Set up the buttons
builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
m_Text = input.getText().toString();
try {
SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage(number, null, m_Text + " Transferred To Your Account From MTM Account", null, null);
} catch (Exception e) {
e.printStackTrace();
}
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.setNegativeButton("NO",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
//
AlertDialog alert1 = builder.create();
alert1.show();
// If you would like to resume scanning, call this method below:
zXingScannerView.resumeCameraPreview(this);
}
// TODO: Rename and change types and number of parameters
public static scan newInstance() {
scan fragment = new scan();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_scan, container, false);
if (checkCameraHardware(getActivity().getApplicationContext())) {
Toast.makeText(this.getActivity(), "camera hardware is free", Toast.LENGTH_SHORT).show();
zXingScannerView = new ZXingScannerView(this.getActivity().getApplicationContext());
zXingScannerView.setResultHandler(this);
zXingScannerView.startCamera(0);
} else {
Toast.makeText(this.getActivity(), "camera hardware is NOT free", Toast.LENGTH_SHORT).show();
}
FrameLayout preview = (FrameLayout) view.findViewById(R.id.camera_preview);
preview.addView(zXingScannerView);
return view;
}
@Override
public void onPause() {
super.onPause();
try {
mCamera = Camera.open();
} catch (RuntimeException e) {
Log.d("camera opening attempt:", e.getMessage());
} finally {
if (mCamera != null) {
Log.d("camera opening attempt:", "yups ");
mCamera.release();
zXingScannerView.stopCamera();
zXingScannerView.stopCameraPreview();
}
}
}
@Override
public void onResume() {
super.onResume();
zXingScannerView.setResultHandler(this); // Register ourselves as a handler for scan results.
zXingScannerView.startCamera(0); // Start camera on resume
}
public boolean checkCameraHardware(Context context) {
if (context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_CAMERA)) {
return true;
} else {
return false;
}
}
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString() +
" must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
Log.d("aa", "sdsdssdsddssssd");
try {
mCamera = Camera.open();
} catch (RuntimeException e) {
Log.d("camera opening attempt:", e.getMessage());
} finally {
if (mCamera != null) {
mCamera.release();
zXingScannerView.stopCamera();
zXingScannerView.stopCameraPreview();
}
}
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name\
void onFragmentInteraction(Uri uri);
}
}MAinactivity
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
public int check = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
message frags = new message();
fragmentTransaction.add(R.id.content_main, frags, "text");
fragmentTransaction.commit();
check += 1;
}
public void message(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
message sms = new message();
fragmentTransaction.replace(R.id.content_main, sms, "text");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
public void scan(View v) {
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
scan scan = new scan();
fragmentTransaction.replace(R.id.content_main, scan, "scan");
fragmentTransaction.addToBackStack(null);
fragmentTransaction.commit();
}
public void loadooncreate() {
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
message frags = new message();
fragmentTransaction.add(R.id.content_main, frags, "text");
fragmentTransaction.commit();
check += 1;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
Toolbar toolbar2 = (Toolbar) findViewById(R.id.toolbar1);
toolbar2.inflateMenu(R.menu.notify);
toolbar2.getMenu().findItem(R.id.notifications).setIcon(buildCounterDrawable(2, R.drawable.notification));
toolbar2.setOnMenuItemClickListener(new Toolbar.OnMenuItemClickListener() {
@Override
public boolean onMenuItemClick(MenuItem arg0) {
if (arg0.getItemId() == R.id.notifications) {
arg0.setIcon(buildCounterDrawable(0, R.drawable.notification));
((RelativeLayout) findViewById(R.id.content_main)).removeAllViews();
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
BlankFragment frag = new BlankFragment();
fragmentTransaction.add(R.id.content_main, frag, "first");
fragmentTransaction.commit();
}
return false;
}
});
check = 1;
return true;
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
//code to reset view
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
if (fragmentManager.findFragmentByTag("first") != null) {
fragmentTransaction.remove(fragmentManager.findFragmentByTag("first"));
fragmentTransaction.commit();
loadooncreate();
} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}
private Drawable buildCounterDrawable(int count, int backgroundImageId) {
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate(R.layout.counter_menuitem_layout, null);
view.setBackgroundResource(backgroundImageId);
if (count == 0) {
View counterTextPanel = view.findViewById(R.id.counterValuePanel);
counterTextPanel.setVisibility(View.GONE);
} else {
// TextView textView = (TextView) view.findViewById(count);
// textView.setText("1");
}
view.measure(
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED),
View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
view.setDrawingCacheEnabled(true);
view.setDrawingCacheQuality(View.DRAWING_CACHE_QUALITY_HIGH);
Bitmap bitmap = Bitmap.createBitmap(view.getDrawingCache());
view.setDrawingCacheEnabled(false);
return new BitmapDrawable(getResources(), bitmap);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
if (check > 3) {
Toast.makeText(this.getApplicationContext(), "sdsdsdfdsfsd", Toast.LENGTH_SHORT).show();
MenuItem item = menu.getItem(R.id.notifications);
item.setIcon(buildCounterDrawable(2, R.drawable.notification));
}
//MenuItem item = (MenuItem)findViewById(R.id.notifications);
// item.setIcon(buildCounterDrawable(2, R.drawable.notification));
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.Home) {
//close current fragment;
FragmentManager fragmentManager = getFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
if (fragmentManager.findFragmentByTag("first") != null)
fragmentTransaction.remove(fragmentManager.findFragmentByTag("first"));
fragmentTransaction.commit();
loadooncreate();
}
return super.onOptionsItemSelected(item);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}最後のスタックエラー
W/MessageQueue: Handler (android.hardware.Camera$EventHandler) {428e2000} sending message to a Handler on a dead thread
java.lang.RuntimeException: Handler (android.hardware.Camera$EventHandler) {428e2000} sending message to a Handler on a dead thread
at android.os.MessageQueue.enqueueMessage(MessageQueue.java:294)
at android.os.Handler.sendMessageAtTime(Handler.java:473)
at android.os.Handler.sendMessageDelayed(Handler.java:446)
at android.os.Handler.sendMessage(Handler.java:383)
at android.hardware.Camera.postEventFromNative(Camera.java:852)
at dalvik.system.NativeStart.run(Native Method)
なぜdetach（）でカメラを再び開いていますか？この問題はおそらく、カメラを適切に解放していないためです。 –
どのように正確にカメラをリリースするには？ Plusのデタッチは、私がフラグメントを置き換えているので呼び出されません。削除しない。 –
プラスカメラがフリーであるかどうかを確認するために開いていますか？私は最終的にカメラをrelaseingしていますが、デタッチはどこに呼び出されているのですか？それは太陽と呼ばれていません。 –