Android Studio之多個Activity的滑動切換（二）

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1、因為Android介面上的全部控制項一般都位於Layout控制項（比方RelativeLayout）之上，而布局控制項能夠設定響應touch事件，所以能夠通過布局控制項的setOnTouchListen來截獲touch事件。做進一步的處理。

2、關於介面滑動。涉及到gesture的處理，而gesture（手勢）是touch事件的更高一層的事件，能夠將touch事件傳入GestureDetector對象進行處理，而建立GestureDetector對象，要首先建立OnGestureListener對象，在OnGestureListener的OnFling函數中能夠進行手勢識別。

3、詳細流程。

實現OnTouchListen和OnGestureListen兩個抽象類別，同一時候實現當中的抽象函數就可以。

（1）IntellisenseActivity中繼承抽象類別

（2）建立布局控制項RelativeLayout的id為relativelayout

（3）代碼編寫

<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) {        //手勢識別        //e1:起點資訊        //e2:終點資訊        //velocityX:x方向移動速度        //velocityY:y方向移動速度        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事件交給GestureDetector處理        //return false;    }}</span>

（3） PCCtrlActivity中做與IntellisenseActivity相近的處理

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);    }}

參考文獻

參考文獻1

參考文獻2

Android Studio之多個Activity的滑動切換（二）