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Android Studio之多个Activity的滑动切换(二)
1、因为Android界面上的全部控件一般都位于Layout控件(比方RelativeLayout)之上,而布局控件能够设置响应touch事件,所以能够通过布局控件的setOnTouchListen来截获touch事件。做进一步的处理。
2、关于界面滑动。涉及到gesture的处理,而gesture(手势)是touch事件的更高一层的事件,能够将touch事件传入GestureDetector对象进行处理,而创建GestureDetector对象,要首先创建OnGestureListener对象,在OnGestureListener的OnFling函数中能够进行手势识别。
3、详细流程。
实现OnTouchListen和OnGestureListen两个抽象类,同一时候实现当中的抽象函数就可以。
(1)IntellisenseActivity中继承抽象类
(2)创建布局控件RelativeLayout的id为relativelayout
(3)代码编写
<span style="font-size:14px;">package com.design.cjc.intellisense; import android.content.Intent; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.GestureDetector; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.RelativeLayout; public class IntellisenseActivity extends ActionBarActivity implements View.OnTouchListener,GestureDetector.OnGestureListener{ private RelativeLayout rl; private GestureDetector gd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_intellisense); rl=(RelativeLayout)findViewById(R.id.relativelayout); rl.setOnTouchListener(this); rl.setLongClickable(true); //非常重要 gd=new GestureDetector((GestureDetector.OnGestureListener)this); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_intellisense, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public boolean onDown(MotionEvent e) { return false; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { //手势识别 //e1:起点信息 //e2:终点信息 //velocityX:x方向移动速度 //velocityY:y方向移动速度 final int FLING_MIN_DISTANCE=100; final int FLING_MIN_VELOCITY=200; if(e1.getX() - e2.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY){ Intent intent = new Intent(IntellisenseActivity.this, PCCtrlActivity.class); startActivity(intent); } return false; } @Override public boolean onTouch(View v, MotionEvent event) { return gd.onTouchEvent(event); //touch事件交给GestureDetector处理 //return false; } } </span>
package com.design.cjc.intellisense; import android.content.Intent; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.GestureDetector; import android.view.Menu; import android.view.MenuItem; import android.view.MotionEvent; import android.view.View; import android.widget.RelativeLayout; public class PCCtrlActivity extends ActionBarActivity implements View.OnTouchListener,GestureDetector.OnGestureListener { private RelativeLayout rl; private GestureDetector gd; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_pcctrl); rl=(RelativeLayout)findViewById(R.id.relativelayout); rl.setOnTouchListener(this); rl.setLongClickable(true); //非常重要 gd=new GestureDetector((GestureDetector.OnGestureListener)this); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.menu_pcctrl, menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { // Handle action bar item clicks here. The action bar will // automatically handle clicks on the Home/Up button, so long // as you specify a parent activity in AndroidManifest.xml. int id = item.getItemId(); //noinspection SimplifiableIfStatement if (id == R.id.action_settings) { return true; } return super.onOptionsItemSelected(item); } @Override public boolean onDown(MotionEvent e) { return false; } @Override public void onShowPress(MotionEvent e) { } @Override public boolean onSingleTapUp(MotionEvent e) { return false; } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { return false; } @Override public void onLongPress(MotionEvent e) { } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { final int FLING_MIN_DISTANCE=100; final int FLING_MIN_VELOCITY=200; if(e1.getX() - e2.getX() > FLING_MIN_DISTANCE && Math.abs(velocityX) > FLING_MIN_VELOCITY){ Intent intent = new Intent(PCCtrlActivity.this,IntellisenseActivity.class); startActivity(intent); } return false; } @Override public boolean onTouch(View v, MotionEvent event) { return gd.onTouchEvent(event); } }
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Android Studio之多个Activity的滑动切换(二)
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