我有嵌套布局。内部相对布局我想设置拖动图像，但问题是图像跨越边界，可以拖动到其他布局。我想限制其区域中的图像，以便它们不会被拖到边界之外。我已经计算了特定布局的宽度和高度，但我无法在特定布局上设置图像。请问有什么解决方案吗？ xml布局：
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/R1Layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="@drawable/wood_bg"
android:orientation="vertical" >
<RelativeLayout
android:id="@+id/R2Layout2"
android:layout_width="wrap_content"
android:layout_height="100dp"
android:background="@drawable/wood_bg" >
<ImageView
android:id="@+id/playerimage1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/playerimage2"
android:layout_alignParentLeft="true"
android:layout_marginLeft="35dp"
android:src="@drawable/player1" />
<ImageView
android:id="@+id/playerimage2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignTop="@+id/playerimage4"
android:layout_marginLeft="39dp"
android:layout_toRightOf="@+id/playerimage1"
android:src="@drawable/player2" />
<ImageView
android:id="@+id/playerimage3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/playerimage2"
android:layout_marginLeft="48dp"
android:layout_toRightOf="@+id/playerimage2"
android:layout_weight="0.16"
android:src="@drawable/player3" />
<ImageView
android:id="@+id/playerimage4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="30dp"
android:layout_toRightOf="@+id/playerimage3"
android:src="@drawable/player4" />
</RelativeLayout>
< ImageButton
android:id="@+id/imageButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentBottom="true"
android:layout_marginBottom="20dp"
android:src="@drawable/chat" />
<RelativeLayout
android:id="@+id/R3Layout"
android:layout_width="wrap_content"
android:layout_height="500dp"
android:layout_below="@+id/relLayout2"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:layout_above="@id/imageButton1"
android:background="@drawable/ludo" >
<ImageView
android:id="@+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="0dp"
android:layout_y="0dp"
android:src="@drawable/green" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="0dp"
android:layout_y="0dp"
android:src="@drawable/green2" />
<ImageView
android:id="@+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_x="0dp"
android:layout_y="0dp"
android:src="@drawable/green3" />
</RelativeLayout>
</RelativeLayout>
这是.java文件代码：
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setContentView(R.layout.main);
// MediaPlayer music =
// MediaPlayer.create(MoveImagesOnTouchActivity.this, R.raw.playback);+
rLayout = (RelativeLayout) findViewById(R.id.R3Layout);
// r2Layout = (RelativeLayout) findViewById(R.id.R2Layout2);
// r1Layout = (RelativeLayout) findViewById(R.id.R1Layout);
//int value= this.rLayout();
//rLayout.layout(10, 10, 10, 10);
// {
// RelativeLayout rLayout = new RelativeLayout(getApplicationContext());
img1 = (ImageView) findViewById(R.id.imageView);
x1 = (int) ((76 * width) / 100);
y1 = (int) ((11 * height) / 100);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(480,423);
//params.leftMargin = x1;
//params.topMargin = y1;
img1.setLayoutParams(params);
img2 = (ImageView) findViewById(R.id.imageView2);
x2 = (int) ((69 * width) / 100);
y2 = (int) ((11 * height) / 100);
RelativeLayout.LayoutParams params2 = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
params2.leftMargin = x2;
params2.topMargin = y2;
img2.setLayoutParams(params2);
img1.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
status = 1;
// Log.i("ImageStatus", "" + status);
// img.setBackgroundColor(Color.WHITE);
int[] values = new int[2];
img1.getLocationOnScreen(values);
// img.getLocationInWindow(values);
int x = values[0];
int y = values[1];
/*
* if (event.getAction() == MotionEvent.ACTION_DOWN){ //
* if(v.getId()==R.id.imageView){} int eventX=(int)event.getX();
* int eventY=(int)event.getY(); int[] values = new int[2];
* values[0]= eventX; values[1]= eventY; Log.i("x is @@@@@@@@",
* +values[0]+ "y is @@@@@@@:" +values[1]);
* //Toast.makeText(MoveImagesOnTouchActivity.this,
* " x is : "+x+ // "y :"+y , 5000).show(); } if
* (event.getAction() == MotionEvent.ACTION_UP){ int
* eventX=(int)event.getX(); int eventY=(int)event.getY(); int[]
* values = new int[2]; values[0]= eventX; values[1]= eventY;
* Toast.makeText(MoveImagesOnTouchActivity.this, " x is : "+x+
* "y :"+y , 5000).show();
*/
// }
// mp=MediaPlayer.create(getApplicationContext(), R.raw.shake);
// mp.start();
return false;
}
});
img2.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
status = 2;
// lp2 = (RelativeLayout.LayoutParams) img2.getLayoutParams();
// Log.i("ImageStatus", "" + status);
// img.setBackgroundColor(Color.WHITE);
int[] values = new int[2];
img2.getLocationOnScreen(values);
// img.getLocationInWindow(values);
int x2 = values[0];
int y2 = values[1];
// Toast.makeText(MoveImagesOnTouchActivity.this,
// " x2 is : "+x2+ "y2 :"+y2 , 500).show();
return false;
}
});
rLayout.setOnTouchListener(new OnTouchListener() {
// green
@Override
public boolean onTouch(View v, MotionEvent event) {
if (status == 1) // any event from down and move
{
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,423);
params.topMargin = (int) event.getY() - img1.getHeight() / 2;
params.leftMargin = (int) event.getX() - img1.getWidth() / 2;
// LayoutParams lp = new
// LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,(int)event.getX()-img.getWidth()/2,(int)event.getY()-img.getHeight()/2);
img1.setLayoutParams(params);
// img.setPadding(20, 40, 20, 40);
// img.setBaseline(baseline)
}
if (status == 2) // any event from down and move
{
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(
LayoutParams.WRAP_CONTENT,
LayoutParams.WRAP_CONTENT);
params.topMargin = (int) event.getY() - img2.getHeight()
/ 2;
params.leftMargin = (int) event.getX() - img2.getWidth()
/ 2;
img2.setLayoutParams(params);
}
答案 0 :(得分：0)
使用marings并不是最好的选择。相反，请查看此课程https://github.com/rfreedman/android-constrained-drag-and-drop-view/blob/master/src/main/java/net/greybeardedgeek/ConstrainedDragAndDropView.java
尤其
protected void updateDragPosition(MotionEvent motionEvent) {}
方法应该让你知道如何做到这一点。获取目标视图，获取其边界（请记住必须首先绘制视图，但如果您使用的听众不应该那么麻烦）并且您很乐意去。