ドラッグ＆ドロップアプリケーションを作成したい初心者

Question

私はAndroid開発の新人ですが、プログラミングに精通しています。私はいくつかの基礎を学んだ。フラグメント、私の最初のAndroidプロジェクトとしてOnClickListenersなどを、私は（下記）背景画像上に図形をドラッグアンドドロップすることができ

1. アプリを作成したいと思います
2. はJPEGとして画像を保存し、それを保存します電話

誰もが、私はこれを達成し、また、適切なチュートリアルに私を指すように知っておくべき概念&ウィジェット教えてもらえますか？ここに行く好ましく動画

Answer 1

。描画可能なフォルダの下に描画可能なフォルダの下 1.activity_main.xml

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

    <LinearLayout 
     android:id="@+id/toplinear" 
     android:layout_width="fill_parent" 
     android:layout_height="170dp" 
     android:layout_marginBottom="10dp" > 

     <ImageView 
      android:id="@+id/image" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:src="@drawable/a" /> 

    </LinearLayout> 

    <LinearLayout 
     android:id="@+id/bottomlinear" 
     android:layout_width="fill_parent" 
     android:layout_height="170dp" 
     > 

     <TextView 
      android:id="@+id/text" 
      android:layout_width="100dp" 
      android:layout_height="100dp" 
      android:text="Drag the image and drop it here..." /> 

    </LinearLayout> 

    <Button 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:visibility="invisible" 
     android:id="@+id/save" 
     android:text="Save as file"/> 

</GridLayout> 

2.shapes.xml

<?xml version="1.0" encoding="UTF-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle" > 

    <stroke 
     android:width="2dp" 
     android:color="#FFFFFFFF" /> 

    <gradient 
     android:angle="225" 
     android:endColor="#DD2ECCFA" 
     android:startColor="#DD000000" /> 

    <corners 
     android:bottomLeftRadius="7dp" 
     android:bottomRightRadius="7dp" 
     android:topLeftRadius="7dp" 
     android:topRightRadius="7dp" /> 

</shape> 

3.target_shape.xml

<?xml version="1.0" encoding="UTF-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="rectangle" > 

    <stroke 
     android:width="2dp" 
     android:color="#FFFF0000" /> 

    <gradient 
     android:angle="225" 
     android:endColor="#DD2ECCFA" 
     android:startColor="#DD000000" /> 

    <corners 
     android:bottomLeftRadius="7dp" 
     android:bottomRightRadius="7dp" 
     android:topLeftRadius="7dp" 
     android:topRightRadius="7dp" /> 

</shape> 

4.MainActivity.java

public class MainActivity extends AppCompatActivity { 

    private ImageView myImage; 
    private static final String IMAGEVIEW_TAG = "The Android Logo"; 
    Button btn; 
    File file,f; 


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

     setContentView(R.layout.activity_main); 
     myImage = (ImageView)findViewById(R.id.image); 
     // Sets the tag 
     myImage.setTag(IMAGEVIEW_TAG); 
     btn = (Button)findViewById(R.id.save); 

     // set the listener to the dragging data 
     myImage.setOnTouchListener(new MyClickListener()); 

     findViewById(R.id.toplinear).setOnDragListener(new MyDragListener()); 
     findViewById(R.id.bottomlinear).setOnDragListener(new MyDragListener()); 

     btn.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       LinearLayout content = (LinearLayout)findViewById(R.id.bottomlinear); 
       content.setDrawingCacheEnabled(true); 
       Bitmap bitmap = content.getDrawingCache(); 


       if (android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED)) 
       { 
        file =new File(android.os.Environment.getExternalStorageDirectory(),"TTImages_cache"); 
        if(!file.exists()) 
        { 
         file.mkdirs(); 

        } 
        f = new File(file.getAbsolutePath()+file.separator+ "filename"+".png"); 
        Toast.makeText(getApplicationContext(),"File saved successfully",Toast.LENGTH_SHORT).show(); 
       } 

       try { 
        FileOutputStream ostream = new FileOutputStream(f); 
        bitmap.compress(Bitmap.CompressFormat.PNG, 10, ostream); 
        ostream.close(); 
       }catch (Exception e){ 
        e.printStackTrace(); 
        //Toast.makeText(getApplicationContext(),"Failed",Toast.LENGTH_SHORT).show(); 
       } 
      } 
     }); 

    } 

    private final class MyClickListener implements View.OnTouchListener { 


     @Override 
     public boolean onTouch(View view, MotionEvent motionEvent) { 
      ClipData.Item item = new ClipData.Item((CharSequence)view.getTag()); 

      String[] mimeTypes = { ClipDescription.MIMETYPE_TEXT_PLAIN }; 
      ClipData data = new ClipData(view.getTag().toString(), mimeTypes, item); 
      View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view); 

      view.startDrag(data, //data to be dragged 
        shadowBuilder, //drag shadow 
        view, //local data about the drag and drop operation 
        0 //no needed flags 
      ); 


      view.setVisibility(View.INVISIBLE); 
      return true; 
     } 

    } 

    class MyDragListener implements View.OnDragListener { 
     Drawable normalShape = getResources().getDrawable(R.drawable.shapes); 
     Drawable targetShape = getResources().getDrawable(R.drawable.shape_drop_target); 

     @Override 
     public boolean onDrag(View v, DragEvent event) { 

      // Handles each of the expected events 
      switch (event.getAction()) { 

       //signal for the start of a drag and drop operation. 
       case DragEvent.ACTION_DRAG_STARTED: 
        // do nothing 
        break; 

       //the drag point has entered the bounding box of the View 
       case DragEvent.ACTION_DRAG_ENTERED: 
        v.setBackground(targetShape); //change the shape of the view 
        break; 

       //the user has moved the drag shadow outside the bounding box of the View 
       case DragEvent.ACTION_DRAG_EXITED: 
        v.setBackground(normalShape); //change the shape of the view back to normal 
        break; 

       //drag shadow has been released,the drag point is within the bounding box of the View 
       case DragEvent.ACTION_DROP: 
        // if the view is the bottomlinear, we accept the drag item 
        if(v == findViewById(R.id.bottomlinear)) { 
         View view = (View) event.getLocalState(); 
         ViewGroup viewgroup = (ViewGroup) view.getParent(); 
         viewgroup.removeView(view); 

         //change the text 
         TextView text = (TextView) v.findViewById(R.id.text); 
         text.setText("The item is dropped"); 

         LinearLayout containView = (LinearLayout) v; 
         containView.addView(view); 
         btn.setVisibility(View.VISIBLE); 
         view.setVisibility(View.VISIBLE); 
        } else { 
         View view = (View) event.getLocalState(); 
         view.setVisibility(View.VISIBLE); 
         Context context = getApplicationContext(); 
         Toast.makeText(context, "You can't drop the image here", 
           Toast.LENGTH_LONG).show(); 
         break; 
        } 
        break; 

       //the drag and drop operation has concluded. 
       case DragEvent.ACTION_DRAG_ENDED: 
        v.setBackground(normalShape); //go back to normal shape 

       default: 
        break; 
      } 
      return true; 
     } 
    } 
} 

5.AndroidManifest.xmlは許可の下に追加

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />