在Android中动态添加Panel框架的实现代码

这里说是框架，说的大了点，其实没有那么复杂，只是一个容易扩展的基类而已。不过至少算是框架类的代码。
代码如下:
package arui; 
import android.app.Activity; 
import android.os.Handler; 
import android.os.Looper; 
import android.os.Message; 
import android.view.Gravity; 
import android.view.LayoutInflater; 
import android.view.View; 
import android.view.ViewGroup.LayoutParams; 
import android.view.ViewManager; 
import android.widget.FrameLayout; 
 
public abstract class BasePanel { 
     
    public static final int LEFT_UP = 1; 
     
    public static final int RIGHT_UP = 2; 
     
    public static final int LEFT_BOTTOM = 3; 
     
    public static final int RIGHT_BOTTOM = 4; 
    private static final int DEFAULT_MARGIN = 10; 
    private static final int SHOW_PANEL = 0; 
    private Activity activity; 
    private LayoutParams parameters; 
    private View view = null; 
    private int layoutId; 
     
    public BasePanel(Activity activity, int layoutId) { 
        this.activity = activity; 
        this.layoutId = layoutId; 
    } 
     
    public void attach(LayoutParams params) { 
        parameters = params; 
        mHandler.sendMessage(mHandler.obtainMessage(SHOW_PANEL)); 
    } 
     
    public void attach(int position) { 
        attach(position, DEFAULT_MARGIN, DEFAULT_MARGIN, DEFAULT_MARGIN, 
                DEFAULT_MARGIN); 
    } 
     
    public void attach(int position, int leftMargin, int topMargin, 
            int rightMargin, int bottomMargin) { 
        FrameLayout.LayoutParams params = null; 
        params = new FrameLayout.LayoutParams(LayoutParams.WRAP_CONTENT, 
                LayoutParams.WRAP_CONTENT); 
        params.setMargins(leftMargin, topMargin, rightMargin, bottomMargin); 
        switch (position) { 
        case LEFT_UP: 
            params.gravity = Gravity.LEFT; 
            break; 
        case RIGHT_UP: 
            params.gravity = Gravity.RIGHT; 
            break; 
        case LEFT_BOTTOM: 
            params.gravity = Gravity.LEFT | Gravity.BOTTOM; 
            break; 
        case RIGHT_BOTTOM: 
            params.gravity = Gravity.RIGHT | Gravity.BOTTOM; 
            break; 
        default: 
            break; 
        } 
        attach(params); 
    } 
     
    publ ic void remove() { 
        if (view != null) { 
            ViewManager mViewManager = (ViewManager) view.getParent(); 
            if (mViewManager != null) { 
                mViewManager.removeView(view); 
            } 
        } 
    } 
    private Handler mHandler = new Handler(Looper.getMainLooper()) { 
        @Override 
        public void handleMessage(Message msg) { 
            switch (msg.what) { 
            case SHOW_PANEL: 
                if (view == null) { 
                    LayoutInflater factory = LayoutInflater.from(activity); 
                    view = factory.inflate(layoutId, null); 
                } 
                dealwithPanel(view); 
                remove(); 
                activity.addContentView(view, parameters); 
                break; 
            } 
        } 
    }; 
     
    public abstract void dealwithPanel(View view); 
} 
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