換膚實現思路(二)

以前寫過一個關於皮膚的換膚思路的博客。但那個裏邊主要是針對於資源換膚，沒有佈局換膚的概念。今天實現了一個可以更換佈局的換膚實現。

 

思路還是上篇文章的思路，只是做了一個簡單的實現。

 

代碼如下：

package com.test.android.skin.main;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Context;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;

public class MainActivity extends Activity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView((View)getResource("main", "layout"));
		Button btn = (Button) findViewById(R.id.btn);
		btn.setBackgroundDrawable((Drawable) getResource("btn_background", "drawable"));
		
		SqLHelper helper = new SqLHelper(this);
		SQLiteDatabase db = helper.getWritableDatabase();
		ContentValues values = new ContentValues();
		values.put("id", "3");
		values.put("packname", "org.yangzc.package3");
		db.insert("skinTab", null, values);
		db.close();
		
		db = helper.getWritableDatabase();
		Cursor c = db.rawQuery("select * from skinTab", null);
        while(c.moveToNext()){
        	String id = c.getString(c.getColumnIndex("id"));
        	String packname = c.getString(c.getColumnIndex("packname"));
        	Log.d("Tag", "Id:"+id + "   packname:" + packname);
        }
	}
	
	private Object getResource(String filename, String defType){
		Context myContext = null;
		try {
			myContext = this.createPackageContext(
					"com.test.android.skin.myskin",
					Context.CONTEXT_IGNORE_SECURITY);
			int id = myContext.getResources().getIdentifier(filename, defType, myContext.getPackageName());
			if("drawable".equals(defType)){
				return myContext.getResources().getDrawable(id);
			}else if("layout".equals(defType)){
				LayoutInflater inflater = (LayoutInflater) myContext.getSystemService(LAYOUT_INFLATER_SERVICE);
				return inflater.inflate(id, null);
			}
		} catch (NameNotFoundException e) {
			e.printStackTrace();
		}
		return null;
	}

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState) {
		super.onRestoreInstanceState(savedInstanceState);
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
	}
}

 

 

方向一：

這幾天看了一下源碼，主要是關於Context的東西。理想化的情況是，進入activity之後首先改一下context，這樣之後框架就會動態實現換膚功能。追到了ContextThemeWrapper類，本來看到了attachBaseContext方法，以爲OK了呢。看到一下代碼鬱悶了。繼續看...

protected void attachBaseContext(Context base) {
        if (mBase != null) {
            throw new IllegalStateException("Base context already set");
        }
        mBase = base;
    }