Android Open Source - android-drag-drop Main Activity

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License

The source code is released under:

MIT License

Java Source Code

package com.example.mydraggable;
//from   ww w.j  av a 2s. co  m
import android.R.integer;
import android.app.Activity;
import android.content.ClipData;
import android.os.Bundle;
import android.util.Log;
import android.view.DragEvent;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.DragShadowBuilder;
import android.view.View.OnDragListener;
import android.view.View.OnLongClickListener;
import android.widget.TextView;


public class MainActivity extends Activity {
  TextView[] mTextViews = new TextView[4];

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    // TextView????
    int[] ids = new int[]{ R.id.textView1, R.id.textView2, R.id.textView3, R.id.textView4 };
    for(int i = 0; i < 4; i++){
      mTextViews[i] = (TextView)findViewById(ids[i]);
    }

    // ??????
    for(int i = 0; i < 4; i++){
      // ????????????????
      mTextViews[i].setOnLongClickListener(new OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
          // ?????
          MyTextView tv = (MyTextView)v;
          ClipData data = ClipData.newPlainText("test", "drag:" + tv.getText().toString());
          // ??????
          v.startDrag(data, new MyDragShadowBuilder(v), v, 0);
          // ?????????????????????????????????????????
          tv.setBorderColor(0xFF0000FF);
          return true;
        }
      });
      // ????????
      mTextViews[i].setOnDragListener(new OnDragListener() {
        @Override
        public boolean onDrag(View v, DragEvent event) {
          MyTextView from = (MyTextView)event.getLocalState();
          MyTextView to = (MyTextView)v;
          String pos = String.format("%s -> %s [%.2f, %.2f] ",
            from.getText().toString(), to.getText().toString(), event.getX(), event.getY());
          switch(event.getAction()){
          case DragEvent.ACTION_DRAG_STARTED:
            // ???????????????????????
            if(from == to){
              return false;
            }
            Log.d("test", pos + "drag started.");
            // ?????????????????????????????????????????????
            to.setBorderColor(0xFFFFFF00);
            return true;
          case DragEvent.ACTION_DRAG_ENDED:
            Log.d("test", pos + "drag ended.");
            // ??????????????
            to.setBorderColor(0xFF000000);
            return true;
          case DragEvent.ACTION_DRAG_LOCATION:
            // Log.d("test", pos + "drag location."); // ??????????????????????????????
            return true;
          case DragEvent.ACTION_DROP:
            // ??
            Log.d("test", pos + "drop.");
            // ????????
            ClipData data = event.getClipData();
            Log.d("test", "---- clip data ----");
            for(int i = 0; i < data.getItemCount(); i++){
              ClipData.Item item = data.getItemAt(i);
              Log.d("test", "  [" + i + "]");
              Log.d("test", "  " + item.toString());
              Log.d("test", "  " + item.getText().toString());
            }
            
            // from?to???????????????
            {
              ViewGroup parent = (ViewGroup)from.getParent();
              parent.removeView(from);
              parent.addView(from, parent.indexOfChild(to));
            }
            return true;
          case DragEvent.ACTION_DRAG_ENTERED:
            Log.d("test", pos + "drag entered.");
            // ??????????????????????????????????????????????
            to.setBorderColor(0xFFFF0000);
            return true;
          case DragEvent.ACTION_DRAG_EXITED:
            Log.d("test", pos + "drag exited.");
            // ??????????????
            to.setBorderColor(0xFFFFFF00);
            return true;
          }
          // TODO Auto-generated method stub
          return false;
        }
      });
    }
  }

  @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);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml.
    int id = item.getItemId();
    if (id == R.id.action_settings) {
      return true;
    }
    return super.onOptionsItemSelected(item);
  }
}

Java Source Code List

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