Question

我正试图在点击时移动图像按钮的位置。我尝试了以下但它在“rlOut.addView（imgP，p）;”崩溃了。在onCreate（）中运行它们没有问题。

公共类Delet3Activity扩展了Activity {

RelativeLayout rlOut;
ImageButton imbBtn;

EditText et1, et2;
ImageView ivB;
ImageButton imgP;
RelativeLayout.LayoutParams p;
RelativeLayout.LayoutParams params;

int mX, mY;

@覆盖

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);

et1 = (EditText)findViewById(R.id.et1);
et2 = (EditText)findViewById(R.id.et2);

imbBtn = (ImageButton)findViewById(R.id.imgBtn);
rlOut = (RelativeLayout)findViewById(R.id.rlOut);
imgP = (ImageButton)findViewById(R.id.imgP);

ivB = new ImageView(this);
ivB.setBackgroundColor(Color.RED);

Display display = getWindowManager().getDefaultDisplay();
int width = display.getWidth();
int height = display.getHeight();

width = width/2-62;
height = height/2-62;
p = new RelativeLayout.LayoutParams(62, 62);    

imbBtn.setOnTouchListener(new View.OnTouchListener() {



    public boolean onTouch(View v, MotionEvent event) {
        // TODO Auto-generated method stub
        LayoutParams par = (LayoutParams)imbBtn.getLayoutParams();

        if(event.getAction()==MotionEvent.ACTION_DOWN)
        {
            Log.d("ok","down");
            mX = (int) event.getX() - imbBtn.getWidth() / 2;
            mY = (int) event.getY() - imbBtn.getHeight() / 2;
            et1.setText("mX down: "+String.valueOf(mX));
            et2.setText("mY down: "+String.valueOf(mY));


        }
        else if (event.getAction()==MotionEvent.ACTION_UP)
        {
            Log.d("ok","up");
            rlOut.addView(ivB, params);
            p.leftMargin=4;
            params.leftMargin = 60;
            params.topMargin = 20;
            rlOut.addView(imgP, p);
            Log.d("ok","p");
        }
        else if (event.getAction()==MotionEvent.ACTION_MOVE)
        {
            Log.d("ok","move");
            mX = (int) event.getX() - imbBtn.getWidth() / 2;
            mY = (int) event.getY() - imbBtn.getHeight() / 2;
            et1.setText("mX move: "+String.valueOf(mX));
            et2.setText("mY move: "+String.valueOf(mY));
        }
        return false;
    }
});

} }

Answer 1

OnCreate方法是您设置setContentView(R.layout.main)的地方。我认为变量rlOut代表RelativeLayout，它可能位于您的主要布局中。在设置contentView并使用rlOut 初始化变量findViewById后，在OnCreate方法中调用上述函数。或者，如果变量rlOut位于其他布局文件中，则您必须首先使用布局过热器对该布局进行充气，然后使用findViewById方法查找该视图。

希望这有帮助。

修改

以下代码应该是您正在寻找的解决方案：

imbBtn.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { LayoutParams par = (LayoutParams)imbBtn.getLayoutParams(); if (event.getAction()==MotionEvent.ACTION_MOVE) { Log.d("ok","move"); mX = (int) event.getX() - imbBtn.getWidth() / 2; mY = (int) event.getY() - imbBtn.getHeight() / 2; par.leftMargin = imbBtn.getLeft() + mX; par.topMargin = imbBtn.getTop() + mY; imbBtn.setLayoutParams(par); et1.setText("mX move: "+String.valueOf(mX)); et2.setText("mY move: "+String.valueOf(mY)); } return false; } });

MotionEvent.ACTION_MOVE是您需要捕获的唯一事件。希望这个解决方案对您有所帮助。

如何在onClick上更改imageButton的位置

1 个答案: