我现在正在实施拖拽和放大删除relative_layout。我有一个扩展Relativelayout的类。 当我将相对布局拖到另一个布局时，我想将相对布局自动放置在容器的中心（相对布局），编码如（android：layout_centerInParent =“true”from xml）。
这是我的类扩展相对布局：
public class Test extends RelativeLayout {
ImageView image2;
public RL(Context context){
super(context);
TextView txtName= new TextView(context);
TextView bac_Number= new TextView(context);
ImageView image = new ImageView(context);
ImageView image1 = new ImageView (context);
ImageView image2 = new ImageView(context);
txtName.setText("First");
// bac.setId(1);
txtName.setText("Aung Aung");
image.setImageResource(R.drawable.fcb);
image1.setImageResource(R.drawable.upload);
image2.setImageResource(R.drawable.guest);
bac_Number.setText("8");
RelativeLayout.LayoutParams lpSecond = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
addView(txtName, lpSecond);
RelativeLayout.LayoutParams lpFirst = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
//lpFirst.addRule(RelativeLayout.RIGHT_OF, second.getId());
addView(bac_Number, lpFirst);
RelativeLayout.LayoutParams lpThird = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
addView(image, lpThird);
}
}
这是我在课堂上面调用的活动
public class MainActivity extends Activity {
Button btn_Choose;
int p;
String[] series = {"Photo","Name","Back Number"};
String[] series1 = {"myPhoto","GuestPhoto","Default"};
GridLayout layoutmain;
private static final String IMAGEVIEW_TAG = "The Android Logo";
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
RL r = new RL(this);
RL r1 = new RL(this);
RL r2 = new RL(this);
RL r3 = new RL(this);
RL r4 = new RL(this);
setContentView(R.layout.activity_main);
layoutmain = (GridLayout)findViewById(R.id.layoutmain);
layoutmain.addView(r);
r.setGravity(Gravity.CENTER);
layoutmain.addView(r1);
layoutmain.addView(r2);
layoutmain.addView(r3);
layoutmain.addView(r4);
btn_Choose = (Button)findViewById(R.id.btnselect);
r.setTag(IMAGEVIEW_TAG);
r1.setTag(IMAGEVIEW_TAG);
r2.setTag(IMAGEVIEW_TAG);
r3.setTag(IMAGEVIEW_TAG);
r4.setTag(IMAGEVIEW_TAG);
// myImage.setOnLongClickListener(new MyClickListener());
r.setOnLongClickListener(new MyClickListener());
r1.setOnLongClickListener(new MyClickListener());
r2.setOnLongClickListener(new MyClickListener());
r3.setOnLongClickListener(new MyClickListener());
r4.setOnLongClickListener(new MyClickListener());
findViewById(R.id.toplinear).setOnDragListener(new MyDragListener());
findViewById(R.id.bottomlinear).setOnDragListener(new MyDragListener());
findViewById(R.id.bottomlinear1).setOnDragListener(new MyDragListener());
findViewById(R.id.layoutlinear).setOnDragListener(new MyDragListener());
findViewById(R.id.layoutmain).setOnDragListener(new MyDragListener());
}
private final class MyClickListener implements OnLongClickListener {
@Override
public boolean onLongClick(View view) {
// TODO Auto-generated method stub
ClipData.Item item = new ClipData.Item((CharSequence)view.getTag());
String[] mimeTypes = { ClipDescription.MIMETYPE_TEXT_PLAIN };
ClipData data = new ClipData(view.getTag().toString(), mimeTypes, item);
DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
view.startDrag( data,
shadowBuilder,
view,
0
);
return true;
}
}
class MyDragListener implements OnDragListener {
Drawable normalShape = getResources().getDrawable(R.drawable.normal_shape);
Drawable targetShape = getResources().getDrawable(R.drawable.target_shape);
@Override
public boolean onDrag(View v, DragEvent event) {
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
Toast.makeText(getApplicationContext(), "Start Drag ", Toast.LENGTH_LONG).show();
break;
case DragEvent.ACTION_DRAG_ENTERED:
v.setBackground(targetShape); //change the shape of the view
break;
case DragEvent.ACTION_DRAG_EXITED:
v.setBackground(normalShape); //change the shape of the view back to normal
break;
case DragEvent.ACTION_DROP:
if(v.getClass().toString().equals("class android.widget.RelativeLayout")){
Log.i("class","Relative");
View view = (View) event.getLocalState();
ViewGroup viewgroup = (ViewGroup) view.getParent();
viewgroup.removeView(view);
RelativeLayout containView = (RelativeLayout) v;
containView.addView(view);
view.setVisibility(View.VISIBLE);
}
else {
Log.i("CLAss", v.getClass()+"Cant drop");
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;
case DragEvent.ACTION_DRAG_ENDED:
v.setBackground(normalShape); //go back to normal shape
default:
break;
}
return true;
}
}
public void goClick(View v){
if (v.getId() == R.id.btnselect){
RotationPickerDialog dp = new RotationPickerDialog(this, series, new RotationPickerListener() {
@Override
public void OnDoneButton(Dialog rotationdialog, String r, int position) {
// TODO Auto-generated method stub
rotationdialog.dismiss();
btn_Choose.setText(r);
p = position ;
}
});
WindowManager.LayoutParams WMLP = dp.getWindow().getAttributes();
WMLP.x = 100;
WMLP.y = 250;
dp.getWindow().setAttributes(WMLP);
dp.show();
Log.i("p", p+"");
Toast.makeText(this, "Opponent Team Name", Toast.LENGTH_LONG).show();
}
}
}
答案 0 :(得分：1)
您可以向RelativeLayout.LayoutParams添加规则：
RelativeLayout.LayoutParams lp=(RelativeLayout.LayoutParams)r.getLayoutParams();
lp.addRule(RelativeLayout.CENTER_IN_PARENT);
答案 1 :(得分：0)
试试这个......
Rl.setGravity(RelativeLayout.CENTER_IN_PARENT);