Question

我有很多TextViews，我想为所有项目更改颜色，因为用户只需点击一下即可将光标拖到它们上。

我使用了setontouchlistener，但此方法仅针对第一个按钮调用操作。无论如何，当用鼠标滑过它们时，同一个点击的所有人都可以做到吗？

这是我的代码：

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity  {

    TextView tv1,tv2,tv3,tv4,tv5;
    Button bu,bu1,bu2;


    MyTouchListener touchListener = new MyTouchListener();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tv1.setId(1);
        tv2.setId(2);
        tv3.setId(3);
        tv4.setId(4);
        tv5.setId(5);


        tv1.setOnTouchListener(touchListener);
        tv2.setOnTouchListener(touchListener);
        tv3.setOnTouchListener(touchListener);
        tv4.setOnTouchListener(touchListener);
        tv5.setOnTouchListener(touchListener);
    }

    public class MyTouchListener implements View.OnTouchListener {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            switch(v.getId()){
                case 1:
                    tv1.setTextColor(0xffff0000);
                    break;
                case 2:
                    tv2.setTextColor(0xffff0000);
                    break;
                case 3:
                    tv3.setTextColor(0xffff0000);
                    break;
                case 4:
                    tv4.setTextColor(0xffff0000);
                    break;
                case 5:
                    tv5.setTextColor(0xffff0000);
                    break;
            }
            return true;
        }

    }

}

Answer 1

如果我正确理解您，您希望在用户触摸屏幕或在触摸屏幕时将手指移动到TextView的内容上时执行代码。由于默认情况下所有触摸事件都不会传递给子视图，因此处理此问题的一种方法是覆盖活动的onTouchEvent方法并检查每个TextView的位置。我为你做了一个例子：

pulic class SomeActivity extends Activity {
    private TextView tv01;
    ... 
    @Override
    public boolean onTouchEvent(MotionEvent event) {

        // Get the center location of the TextView. 
        int[] tv01pos = {(int) tv01.getX(), (int) tv01.getY()};

        // Some debuging logs, may be deleted.
        Log.d("position TV x", String.valueOf(tv01pos[0]));
        Log.d("position TV y", String.valueOf(tv01pos[1]));

        // Get the width and height of textView 01 for calculating the right and bottom boundaries.
        int tv01Wide =  tv01.getWidth();
        int tv01High = tv01.getHeight();

        // Get the location of the touch event, event may be of type Donw, Move, or Up. 
        // Keep in mind there are a LOT of these generated.
        int[] touchPos = new int[2];
        touchPos[0] = (int) event.getAxisValue(MotionEvent.AXIS_X);
        touchPos[1] = (int) event.getAxisValue(MotionEvent.AXIS_Y);

        // More debug logs.
        Log.d("position Tch x", String.valueOf(touchPos[0]));
        Log.d("position Tch y", String.valueOf(touchPos[1]));

        // Check if the touch event is in the boundaries of TextView 01
        if (    (touchPos[0] > tv01pos[0]           ) &&
                (touchPos[0] < tv01pos[0] + tv01Wide) &&
                (touchPos[1] > tv01pos[1]           ) &&
                (touchPos[1] < tv01pos[1] + tv01High)) {

            // A toast letting you know it's working.  Put your code here.
            Toast.makeText(view.getContext(), "In TextView01", Toast.LENGTH_SHORT).show();
        }

        return true;
    }
}

android setOnTouchListener更改多项

1 个答案: