android 拖动图片拖动浮动按钮.docx

android 拖动图片/拖动浮动按钮Java代码 import android.app.Activity; import android.content.Context; import android.graphics.Canvas; import android.os.Bundle; import android.view.MotionEvent ; import android.widget.AbsoluteLayout; import android.widget.Button; public class Drag_And_Drop extends Activity /* Called when the activity is first created. */ Override public void onCreate(Bundle icicle) super.onCreate(icicle); MyView tx = new MyView(this); tx.setText(Drag Me); AbsoluteLayout l = new AbsoluteLayout(this); AbsoluteLayout.LayoutParams p = new AbsoluteLayout.LayoutParams( AbsoluteLayout.LayoutParams.WRAP_CONTENT, AbsoluteLayout.LayoutParams.WRAP_CONTENT,10,10); l.addView(tx,p); setContentView(l); class MyView extends Button public MyView(Context c) super(c); Override public boolean onMotionEvent(MotionEvent event) int action = event.getAction(); int mCurX = (int)event.getX(); int mCurY = (int)event.getY(); if ( action = MotionEvent.ACTION_MOVE ) /this.setText(x: + mCurX + ,y: + mCurY ); AbsoluteLayout.LayoutParams p = new AbsoluteLayout.LayoutParams(AbsoluteLayout.LayoutParams.WRAP_CONTENT, AbsoluteLayout.LayoutParams.WRAP_CONTENT,this.mLeft + mCurX,this.mTop + mCurY); this.setLayoutParams (p); if ( action = MotionEvent.ACTION_UP ) /this.setText(not moving); return true; Override public void draw(Canvas canvas) / TODO Auto-generated method stub super.draw(canvas); 拖拽图片效果 方法一： Java代码 import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; public class DragSample01 extends Activity ImageView img; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.drag_sample01); img = (ImageView)findViewById(R.id.img_view); img.setOnTouchListener(new OnTouchListener() private int mx, my; public boolean onTouch(View v, MotionEvent event) switch(event.getAction() case MotionEvent.ACTION_MOVE: mx = (int)(event.getRawX(); my = (int)(event.getRawY() - 50); v.layout(mx - img.getWidth()/2, my - img.getHeight()/2, mx + img.getWidth()/2, my + img.getHeight()/2); break; return true; ); 方法二： Java代码 import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.View; import android.view.View.OnTouchListener; import android.widget.ImageView; public class DragSample01 extends Activity ImageView img; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); setContentView(R.layout.drag_sample01); img = (ImageView)findViewById(R.id.img_view); img.setOnTouchListener(new OnTouchListener() private float x, y; private int mx, my; public boolean onTouch(View v, MotionEvent event) switch(event.getAction() case MotionEvent.ACTION_DOWN: x = event.getX(); y = event.getY(); case MotionEvent.ACTION_MOVE: mx = (int)(event.getRawX() - x); my = (int)(event.getRawY() - 50 - y); v.layout(mx, my, mx + v.getWidth(), my + v.getHeight(); break; return true; ); 拖动按钮到处跑 1. 布局文件 Xml代码 2. 代码 Java代码 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 temp0 = (int) event.getX(); temp1 = y - v.getTop(); break; case MotionEvent.ACTION_MOVE: / touch drag with the ball v.layout(x - temp0, y - temp1, x + v.getWidth() - temp0, y - temp1 + v.getHeight(); / v.postInvalidate(); break; case MotionEvent.ACTION_UP: break; return false; ); 另一种： Java代码 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 screenWidth) right = screenWidth; left = right - v.getWidth(); if (top 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； Java代码 import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.text.style.AbsoluteSizeSpan; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.View.OnClickListener; import android.view.View.OnTouchListener; import android.widget.AbsoluteLayout; import android.widget.Button; public class HelloWorld2 extends Activity /* Called when the activity is first created. */ AbsoluteLayout mLayoutGroup = null; Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); /setContentView(R.layout.main); mLayoutGroup = new AbsoluteLayout(this); AbsoluteLayout.LayoutParams layoutParams = new AbsoluteLayout.LayoutParams (320, 480, 0, 0); setContentView(mLayoutGroup, layoutParams); Button button= new Button(this); button.setText(testButton); layoutParams = new AbsoluteLayout.LayoutParams(120, 60, 20, 20); mLayoutGroup.addView(button, layoutParams); button.setOnClickListener(new OnClickListener() public void onClick(View arg0) / TODO Auto-generated method stub /alert(); ); button.setOnTouchListener(touchListener); final Button btButton = new Button(this); btButton.setText(测试按钮移动); layoutParams = new AbsoluteLayout.LayoutParams(120, 60, 20, 160); mLayoutGroup.addView(btButton, layoutParams); btButton.setOnTouchListener(touchListener); OnTouchListener touchListener = new OnTouchListener() int temp = new int0, 0; public boolean onTouch(View arg0, MotionEvent arg1) / TODO Auto-generated method stub int eventAction = ar