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触摸滑动实现直线选择
先看效果图:
源代码:
package com.momo.selectvalue; 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; import android.widget.LinearLayout; import android.widget.TextView; public class MainActivity extends Activity implements OnTouchListener { private ImageView strength_select; private LinearLayout strength_select_bg; private LinearLayout strength_select_tvs; private int typeStrength = 1 ; private int lastX; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); strength_select = (ImageView) findViewById(R.id.strength_select); strength_select.setOnTouchListener(this); strength_select_bg = (LinearLayout)findViewById(R.id.strength_select_bg); strength_select_tvs = (LinearLayout) findViewById(R.id.strength_select_tvs); strength_select_bg.setOnTouchListener(this); } @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub if(v.getId() == R.id.strength_select_bg){ setSlidePointPosition((int) event.getX()); return false; } int width = strength_select_bg.getMeasuredWidth(); int pointWidth = v.getWidth(); switch(event.getAction()){ case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX(); strength_select_bg.requestDisallowInterceptTouchEvent(true); break; case MotionEvent.ACTION_MOVE: int detelX = (int) (event.getRawX() - lastX); int left = v.getLeft() + detelX; int right = left + pointWidth; if(right > width || left < 0){ return false; } v.layout(left, v.getTop(), right, v.getBottom()); lastX = (int) event.getRawX(); break; case MotionEvent.ACTION_CANCEL: case MotionEvent.ACTION_UP: int left2 = (int) (v.getLeft() + pointWidth*0.5); setSlidePointPosition(left2); break; } return false; } private void setSlidePointPosition(int leftPosition){ ((TextView)strength_select_tvs.getChildAt(typeStrength*2-2)).setTextSize(12); int pointWidth = strength_select.getMeasuredWidth(); int width = strength_select_bg.getMeasuredWidth(); int unitWidth = (width - pointWidth)/6; ImageView v = strength_select; if(leftPosition > unitWidth*5+pointWidth/2){ v.layout(width-pointWidth, v.getTop(), width, v.getBottom()); ((TextView)strength_select_tvs.getChildAt(6)).setTextSize(18); typeStrength = 4; }else if(leftPosition <= unitWidth*5+pointWidth/2 && leftPosition > unitWidth*3+pointWidth/2){ v.layout(unitWidth*4, v.getTop(), unitWidth*4+pointWidth, v.getBottom()); ((TextView)strength_select_tvs.getChildAt(4)).setTextSize(18); typeStrength = 3; }else if(leftPosition > unitWidth+pointWidth/2 && leftPosition <= unitWidth*3+pointWidth/2){ v.layout(unitWidth*2, v.getTop(), unitWidth*2+pointWidth, v.getBottom()); ((TextView)strength_select_tvs.getChildAt(2)).setTextSize(18); typeStrength = 2; }else{ v.layout(0, v.getTop(), pointWidth, v.getBottom()); ((TextView)strength_select_tvs.getChildAt(0)).setTextSize(18); typeStrength = 1; } } }
触摸滑动实现直线选择
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