拖动后如何将布局恢复到android中的原始位置

概述我正在做一个项目.我需要在其中拖动布局的地方设法移动(拖动)布局,但是当我松开触摸时,它并没有到达其原始位置.请任何人告诉我我应该在MotionEvent.ACTION_UP中做什么,以便我可以将布局恢复到原始位置.以下是我的代码.importandroid.app.Activity;importandroid.os.Bundle;

我正在做一个项目.我需要在其中拖动布局的地方设法移动(拖动)布局,但是当我松开触摸时,它并没有到达其原始位置.

请任何人告诉我我应该在MotionEvent.ACTION_UP中做什么,以便我可以将布局恢复到原始位置.

以下是我的代码.

import androID.app.Activity;import androID.os.Bundle;import androID.util.Log;import androID.vIEw.MotionEvent;import androID.vIEw.VIEw;import androID.vIEw.VIEw.OntouchListener;import androID.vIEw.VIEwGroup;import androID.Widget.relativeLayout;public class HomeActivity extends Activity implements OntouchListener {    relativeLayout _vIEw;    relativeLayout _vIEw1;    // TextVIEw _vIEw;    VIEwGroup _root;    private int _xDelta;    relativeLayout.LayoutParams lParams;    relativeLayout.LayoutParams mainlParams;    private int _yDelta;    // private int X1, Y1, wIDth;    @OverrIDe    protected voID onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentVIEw(R.layout.main);        _root = (VIEwGroup) findVIEwByID(R.ID.root);        _vIEw = (relativeLayout) findVIEwByID(R.ID.relativeLayout);        _vIEw.setontouchListener(this);        lParams = (relativeLayout.LayoutParams) _vIEw.getLayoutParams();        mainlParams = (relativeLayout.LayoutParams) _vIEw.getLayoutParams();        // _root.addVIEw(_vIEw1);    }    public boolean ontouch(VIEw vIEw, MotionEvent event) {        int X = (int) event.getRawX();        int Y = (int) event.getRawY();        relativeLayout.LayoutParams layoutParams;        lParams = (relativeLayout.LayoutParams) vIEw.getLayoutParams();        switch (event.getAction() & MotionEvent.ACTION_MASK) {        case MotionEvent.ACTION_DOWN:            Log.e("", "insIDe ACTION_DOWN");            lParams = (relativeLayout.LayoutParams) vIEw.getLayoutParams();            _xDelta = X - lParams.leftmargin;            _yDelta = Y - lParams.topmargin;            break;        case MotionEvent.ACTION_UP:            Log.e("", "insIDe ACTION_UP");            if ((X - _xDelta) < -150) {                _root.removeVIEw(_vIEw);            } else {                vIEw.setLayoutParams(mainlParams);            }            break;        case MotionEvent.ACTION_MOVE:            Log.e("", "insIDe ACTION_MOVE");            layoutParams = (relativeLayout.LayoutParams) vIEw.getLayoutParams();            layoutParams.leftmargin = X - _xDelta;            layoutParams.topmargin = Y - _yDelta;            layoutParams.rightmargin = -250;            layoutParams.bottommargin = -250;            vIEw.setLayoutParams(layoutParams);            break;        }        _root.invalIDate();        return true;    }}

解决方法:

新编辑

在这里,我向您展示了一种非常简单的方法(并且代码不是很干净),该如何做您想做的事情.我有一个带有绿色linearLayout的relativeLayout：

    <relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:ID="@+ID/relative_layout"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"tools:context=".MainActivity" ><linearLayout    androID:ID="@+ID/moving_layout"    androID:layout_wIDth="100dp"    androID:layout_height="100dp"    androID:background="#00ff00"    androID:gravity="center"    androID:orIEntation="vertical" >    <TextVIEw        androID:layout_wIDth="wrap_content"        androID:layout_height="wrap_content"        androID:text="@string/hello_world" /></linearLayout>    </relativeLayout>

然后在您的MainActivity中,将要移动的视图位于其中的topLayout设置为ontouchListener.在ACTION_DOWN上设置originalX和originalY,在ACTION_MOVE上设置moveX和moveY.当用户松开手指时,请返回原始位置：

    public class MainActivity extends Activity implements OntouchListener {private linearLayout mlinearLayout;private relativeLayout mrelativeLayout;private relativeLayout.LayoutParams params;private float originalX = 0;private float originalY = 0;private float moveX = 0;private float moveY = 0;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    mlinearLayout = (linearLayout) findVIEwByID(R.ID.moving_layout);    mrelativeLayout = (relativeLayout) findVIEwByID(R.ID.relative_layout);    mrelativeLayout.setontouchListener(this);    int wIDth = getMetrics(100);    int height = getMetrics(100);    params = new relativeLayout.LayoutParams(wIDth, height);}/** * converts dp to px *  * @param dp * @return */private int getMetrics(int dp) {    displayMetrics displayMetrics = this.getResources().getdisplayMetrics();    return (int) ((dp * displayMetrics.density) + 0.5);}public boolean ontouch(VIEw v, MotionEvent event) {    // Todo auto-generated method stub    switch (event.getAction()) {    case (MotionEvent.ACTION_DOWN):        originalX = event.getX(); //set X start position        originalY = event.getY();//set Y start position        moveX = event.getX();//first move x        moveY = event.getY();//first move y        break;    case (MotionEvent.ACTION_MOVE):        moveX = event.getX();//set move x        moveY = event.getY();//set move y        //set LayoutParams to mlinearLayout        params.leftmargin = (int) moveX;        params.topmargin = (int) moveY;        mlinearLayout.setLayoutParams(params);        break;    case (MotionEvent.ACTION_UP):        //set mlinearLayout back to original position        params.leftmargin = (int) originalX;        params.topmargin = (int) originalY;        mlinearLayout.setLayoutParams(params);        break;    }    return true;}    }

不要怀疑getMetrics()方法,这是因为将与XML定义相同的宽度和高度设置为mlinearLayout.在xml中,将此值设置为dp,在LayoutParams处为px.但这与您的问题无关.
我在这里所做的是,将原始X和Y设置为ACTION_DOWN,然后回到ACTION_UP.因此,每次用户再次按下时,这些值将被“更新”,如果手指松开,则布局将返回到ACTION_DOWN的最后一点.这应该给您一个解决问题的思路.

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