Setzen Sie eine benutzerdefinierte Zeichnungsansicht (Leinwand) in eine Klasse, die Fragment erweitert

Ich muss eine "Seite" erstellen, wo ich mit dem Finger zeichnen kann. Ich habe herausgefunden, wie man bei stackoverflow vorgeht, aber ich möchte keine neue Aktivität erstellen, ich möchte ein Denken wie unten machen, ist das möglich?Setzen Sie eine benutzerdefinierte Zeichnungsansicht (Leinwand) in eine Klasse, die Fragment erweitert

Aufbau der Klasse, die frament erweitert:

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:orientation="vertical"> 

<android.support.v7.widget.CardView 
    xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:card_view="http://schemas.android.com/apk/res-auto" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_gravity="center" 
    android:layout_margin="8dp" 
    card_view:cardCornerRadius="4dp"> 
    <EditText 
     android:id="@+id/note_draw_titolo" 
     android:layout_width="match_parent" 
     android:layout_height="?attr/listPreferredItemHeight" 
     android:gravity="center_vertical" 
     android:padding="8dp" 
     android:hint="Titolo" 
     android:textAlignment="center" 
     android:textStyle="bold" 
     style="@style/Base.TextAppearance.AppCompat.Body2"/> 
</android.support.v7.widget.CardView> 

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_margin="8dp"> 
    <com.marcocreation.********.DrawingView 
     android:id="@+id/drawView" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="#ffffff" 
     android:visibility="visible" 
     android:layout_alignParentBottom="true"> 
    </com.marcocreation.*******.DrawingView> 
</RelativeLayout>

Drawingview Klasse:

public class DrawingView extends View { 

public int width; 
public int height; 
private Bitmap mBitmap; 
private Canvas mCanvas; 
private Path mPath; 
private Paint mBitmapPaint; 
Context context; 
private Paint circlePaint; 
private Path circlePath; 
private Paint mPaint; 

public DrawingView(Context c, AttributeSet attrs, int defStyle) { 
    super(c, attrs, defStyle); 
    context=c; 
    mPath = new Path(); 
    mBitmapPaint = new Paint(Paint.DITHER_FLAG); 
    circlePaint = new Paint(); 
    circlePath = new Path(); 
    circlePaint.setAntiAlias(true); 
    circlePaint.setColor(Color.BLUE); 
    circlePaint.setStyle(Paint.Style.STROKE); 
    circlePaint.setStrokeJoin(Paint.Join.MITER); 
    circlePaint.setStrokeWidth(4f); 
    initPaint(); 
} 

protected void initPaint(){ 
    mPaint = new Paint(); 
    mPaint.setAntiAlias(true); 
    mPaint.setDither(true); 
    mPaint.setColor(Color.GREEN); 
    mPaint.setStyle(Paint.Style.STROKE); 
    mPaint.setStrokeJoin(Paint.Join.ROUND); 
    mPaint.setStrokeCap(Paint.Cap.ROUND); 
    mPaint.setStrokeWidth(12); 
} 

@Override 
protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
    super.onSizeChanged(w, h, oldw, oldh); 

    mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888); 
    mCanvas = new Canvas(mBitmap); 
} 

@Override 
protected void onDraw(Canvas canvas) { 
    super.onDraw(canvas); 

    canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); 
    canvas.drawPath(mPath, mPaint); 
    canvas.drawPath(circlePath, circlePaint); 
} 

private float mX, mY; 
private static final float TOUCH_TOLERANCE = 4; 

private void touch_start(float x, float y) { 
    mPath.reset(); 
    mPath.moveTo(x, y); 
    mX = x; 
    mY = y; 
} 

private void touch_move(float x, float y) { 
    float dx = Math.abs(x - mX); 
    float dy = Math.abs(y - mY); 
    if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) { 
     mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); 
     mX = x; 
     mY = y; 

     circlePath.reset(); 
     circlePath.addCircle(mX, mY, 30, Path.Direction.CW); 
    } 
} 

private void touch_up() { 
    mPath.lineTo(mX, mY); 
    circlePath.reset(); 
    // commit the path to our offscreen 
    mCanvas.drawPath(mPath, mPaint); 
    // kill this so we don't double draw 
    mPath.reset(); 
} 

@Override 
public boolean onTouchEvent(MotionEvent event) { 
    float x = event.getX(); 
    float y = event.getY(); 

    switch (event.getAction()) { 
     case MotionEvent.ACTION_DOWN: 
      touch_start(x, y); 
      invalidate(); 
      break; 
     case MotionEvent.ACTION_MOVE: 
      touch_move(x, y); 
      invalidate(); 
      break; 
     case MotionEvent.ACTION_UP: 
      touch_up(); 
      invalidate(); 
      break; 
    } 
    return true; 
} 
}

Und im customFragment i beginnen alle mit:

public class NoteFragment extends Fragment { 

private EditText sharedTitolo; 
private EditText sharedNota; 
private NoteDataSource notesource; 
private TextView recordTimeText; 
private ImageButton audioSendButton; 
private View recordPanel; 
private View slideText; 
private Context context; 
private DrawingView drawView; 

public static NoteFragment createInstance(int index, int tipo, Context c) { 
    NoteFragment noteFragment = new NoteFragment(c); 
    Bundle bundle = new Bundle(); 
    ... 
    return noteFragment; 
} 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 

} 

@SuppressLint("ValidFragment") 
public NoteFragment (Context c){ 
    this.context = c; 
} 


@Override 
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
    View view = null; 
    Bundle bundle = getArguments(); 
    switch (bundle.getInt("type")){ 
     case 1: 
      ... 
      break; 
     case 2: 
      view = (View) inflater.inflate(R.layout.note_draw_layout, container, false); 
      sharedTitolo = (EditText)view.findViewById(R.id.note_draw_titolo); 
      drawView = (DrawingView)view.findViewById(R.id.drawView); 
      if(bundle.getInt("index")>0){ 
       Log.i("nf_indice",""+bundle.getInt("index")); 
       sharedTitolo.setText("text"); 
      } 
      else{ 
       ... 
      } 
      break; 
     case 3: 
      ... 
      break; 
     default: 
      break; 
    } 

    return view; 
} 
}

Aber ich erhalten diesen Fehler:

android.view.InflateException: Binary XML file line #32: Binary XML file line #32: Error inflating class com.marcocreation.******.DrawingView

ps Notefragment wird durch eine Klasse ins Leben gerufen, die appcompactactivity und schuf eine FragmentPagerAdapter erstreckt, und es hat einen Koordinator Layout.

komplette Fehlerprotokoll:

07-24 11:03:44.805 29830-29830/com.marcocreation.******* E/AndroidRuntime: FATAL EXCEPTION: main 
                      Process: com.marcocreation.*******, PID: 29830 
                      android.view.InflateException: Binary XML file line #28: Binary XML file line #28: Error inflating class com.marcocreation.*******.DrawingView 
                       at android.view.LayoutInflater.inflate(LayoutInflater.java:539) 
                       at android.view.LayoutInflater.inflate(LayoutInflater.java:423) 
                       at com.marcocreation.*******.NoteFragment.onCreateView(NoteFragment.java:86) 
                       at android.support.v4.app.Fragment.performCreateView(Fragment.java:2074) 
                       at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104) 
                       at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1286) 
                       at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:758) 
                       at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:1632) 
                       at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:637) 
                       at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:143) 
                       at android.support.v4.view.ViewPager.populate(ViewPager.java:1235) 
                       at android.support.v4.view.ViewPager.populate(ViewPager.java:1083) 
                       at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1609) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:669) 
                       at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:89) 
                       at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1319) 
                       at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:734) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:669) 
                       at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:736) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                       at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
                       at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
                       at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465) 
                       at android.widget.LinearLayout.measureVertical(LinearLayout.java:748) 
                       at android.widget.LinearLayout.onMeasure(LinearLayout.java:630) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:194) 
                       at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643) 
                       at android.view.View.measure(View.java:18794) 
                       at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100) 
                       at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216) 
                       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452) 
                       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107) 
                       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013) 
                       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858) 
                       at android.view.Choreographer.doCallbacks(Choreographer.java:670) 
                       at android.view.Choreographer.doFrame(Choreographer.java:606)

Quelle

2016-07-23 ghiltanas

zeigen den gesamten Stack-Trace ..... –

i hinzugefügt ..... – ghiltanas

Haben Sie versucht, einen neuen Konstruktor hinzufügen, die die gerade nimmt 'Context' und' AttributeSet' in 'DrawingView'? Soweit ich weiß, ist das derjenige, der während der Inflation genannt wird. – TR4Android

Für die Zukunft, hier ist die Lösung, die funktioniert.

Der View Konstruktor, der während des Aufblasens aufgerufen wird, ist View(Context context, AttributeSet attrs), jedoch ist ein solcher Konstruktor nicht in der DrawingView oben angegeben. Daher konnte das Android-System die Layout-Datei nicht aufblasen, da der entsprechende Konstruktor nicht gefunden werden konnte.

Folgende DrawingView Konstrukteure das Problem lösen sollte:

// Constructor called during inflation 
public DrawingView(Context c, AttributeSet attrs) { 
    this(c, attrs, 0); 
} 

public DrawingView(Context c, AttributeSet attrs, int defStyle) { 
    super(c, attrs, defStyle); 
    // ... 
}

Quelle

2016-07-24 11:58:12 TR4Android

ja, es ist die Antwort, die ich gegründet. Ich fügte es in einem anderen Beitrag hinzu und hoffte, dass es helfen könnte – ghiltanas

Setzen Sie eine benutzerdefinierte Zeichnungsansicht (Leinwand) in eine Klasse, die Fragment erweitert

Antwort

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