Android四分之一屏实现，android,package com.

Android四分之一屏实现，android,package com.

package com.example.oneoffourdemo;import android.app.ActivityGroup;import android.content.Context;import android.content.Intent;import android.os.Bundle;import android.util.DisplayMetrics;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.view.Window;import android.widget.LinearLayout;import android.widget.RelativeLayout;import android.widget.RelativeLayout.LayoutParams;/** * Android 四分之一屏演示示例 * @author xiaolifan 2012-10-25*/public class MainActivity extends ActivityGroup implements OnClickListener{    private static int currentPage = 0;    private LinearLayout mContentView = null;    private LinearLayout mContentViewParent = null;    /**判断四分之一屏是否已经打开*/    private boolean isOpen = true;    /**屏幕宽度*/    private static int mSreenWidth = 0;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        initView();        getScreenWidth();    }    private void initView(){        findViewById(R.id.button1).setOnClickListener(this);        findViewById(R.id.button2).setOnClickListener(this);        findViewById(R.id.button3).setOnClickListener(this);        findViewById(R.id.button4).setOnClickListener(this);        mContentView = (LinearLayout) findViewById(R.id.content_layout);        mContentViewParent = (LinearLayout)findViewById(R.id.content_layout_parent);    }    /**获取屏幕宽度*/    private void getScreenWidth(){        DisplayMetrics metric = new DisplayMetrics();        getWindowManager().getDefaultDisplay().getMetrics(metric);        mSreenWidth = metric.widthPixels;     // 屏幕宽度（像素）    }    @Override    public boolean onCreateOptionsMenu(Menu menu) {        getMenuInflater().inflate(R.menu.activity_main, menu);        return true;    }    @Override    public void onClick(View arg0) {        switch (arg0.getId()) {        case R.id.button1:            openRightWindow("1", 1);            break;        case R.id.button2:            openRightWindow("2", 2);            break;        case R.id.button3:            openLeftPanle();            break;        case R.id.button4:            break;        }    }    private void openLeftPanle(){        if (!isOpen) {            openRightWindow(String.valueOf(currentPage), currentPage);        } else {            RelativeLayout.LayoutParams lp = (LayoutParams) mContentViewParent.getLayoutParams();            int margin = mSreenWidth - dip2px(this, 54);            lp.leftMargin = margin;            lp.rightMargin = -margin;            mContentViewParent.setLayoutParams(lp);            isOpen = false;        }    }    private void openRightWindow(String Id, int which){        if (which != currentPage) {            currentPage = which;            Intent intent = new Intent();            switch (which) {            case 1:                intent.setClass(this, SecondActivity.class);                break;            case 2:                intent.setClass(this, ThirdActivity.class);                break;            }            View view = null;            Window window = getLocalActivityManager().startActivity(Id, intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP));            if (window != null)            {                view = window.getDecorView();            }            mContentView.removeAllViews();            mContentView.addView(view, new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT));        }        RelativeLayout.LayoutParams lp = (LayoutParams) mContentViewParent.getLayoutParams();        lp.leftMargin = 0;        lp.rightMargin = 0;        mContentViewParent.setLayoutParams(lp);        isOpen = true;    }    /**      * 根据手机的分辨率从 dp 的单位 转成为 px(像素)      */      public static int dip2px(Context context, float dpValue) {          final float scale = context.getResources().getDisplayMetrics().density;          return (int) (dpValue * scale + 0.5f);      }      /**      * 根据手机的分辨率从 px(像素) 的单位 转成为 dp      */      public static int px2dip(Context context, float pxValue) {          final float scale = context.getResources().getDisplayMetrics().density;          return (int) (pxValue / scale + 0.5f);      } }