android 拖拽图片&拖动浮动按钮到处跑
来自老外:
拖拽图片效果
方法一:
布局文件
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <Button android:id="@+id/btn" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="拖动看看~~" /> </LinearLayout>
方法二:
import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.Button; public class DraftTest extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); final Button btn = (Button) findViewById(R.id.btn); btn.setOnTouchListener(new OnTouchListener() { int[] temp = new int[] { 0, 0 }; public boolean onTouch(View v, MotionEvent event) { int eventaction = event.getAction(); int x = (int) event.getRawX(); int y = (int) event.getRawY(); switch (eventaction) { case MotionEvent.ACTION_DOWN: // touch down so check if the temp[0] = (int) event.getX(); temp[1] = y - v.getTop(); break; case MotionEvent.ACTION_MOVE: // touch drag with the ball v.layout(x - temp[0], y - temp[1], x + v.getWidth() - temp[0], y - temp[1] + v.getHeight()); // v.postInvalidate(); break; case MotionEvent.ACTION_UP: break; } return false; } }); } }
另一种:
import android.app.Activity; import android.os.Bundle; import android.util.DisplayMetrics; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.Button; public class DraftTest extends Activity { /** Called when the activity is first created. */ public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); DisplayMetrics dm = getResources().getDisplayMetrics(); final int screenWidth = dm.widthPixels; final int screenHeight = dm.heightPixels - 50; final Button b = (Button) findViewById(R.id.btn); b.setOnTouchListener(new OnTouchListener() { int lastX, lastY; public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; int left = v.getLeft() + dx; int top = v.getTop() + dy; int right = v.getRight() + dx; int bottom = v.getBottom() + dy; if (left < 0) { left = 0; right = left + v.getWidth(); } if (right > screenWidth) { right = screenWidth; left = right - v.getWidth(); } if (top < 0) { top = 0; bottom = top + v.getHeight(); } if (bottom > screenHeight) { bottom = screenHeight; top = bottom - v.getHeight(); } v.layout(left, top, right, bottom); lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: break; } return false; } }); } }
再一个,浮动按钮的实现。
主要功能:
点击按钮可以进行拖动;
当点击按钮时按钮会出现于所有按钮的最上方;
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