来源: 互联网  发布时间: 2014-02-18

启用另一个程序某些方法

DexFile df = new DexFile(new File("/data/app/my_downloaded_lib.apk")); 
ClassLoader cl = getClassLoader(); 
Class clazz = df.loadClass("com/my/lib/MyClass", cl); 

2.cl = new DexClassLoader("/full/path/com.example.apk", 
                        getFilesDir().getAbsolutePath(),// /data/data/foo/files 
                        null,  // native lib path, I haven't used this 
                        MyClass.class.getClassLoader()); 
// This doesn't make Class.forName() work, instead I do this: 
Class<?> foo = cl.loadClass("com.example.foo"); 
3.

    

    来源: 互联网  发布时间: 2014-02-18

设置GPS状态
很久没写博客了，人懒事多，没有办法，言归正传，今天就说下设置GPS状态吧。

很久以前就看过android源码，它是这样设置GPS状态的：

private void setGpsState(Context context, boolean state) {
    ContentResolver resolver = context.getContentResolver();
    Settings.Secure.setLocationProviderEnabled(resolver, LocationManager.GPS_PROVIDER, state);
}

可是，在android 2.2以前的版本中，Google并没有给我们的SDK开放这个函数，如果你的工程中用到它，只能到源码环境下去能编。还好，android 2.2中已经开放了这个函数。

Google经常以安全为由，在SDK中关闭了很多API，开发者只能到源码环境下去调用它。我真的很怀疑，难道这样就安全了吗？仅仅是在门口加了个台阶而已。

    

    来源: 互联网  发布时间: 2014-02-18

卸载程序和监听卸载事件

package com.TestUI;

import java.util.List;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.text.format.Time;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import android.view.View.OnClickListener;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.LightingColorFilter;
import android.graphics.PorterDuff;
import android.graphics.PorterDuff.Mode;

public class TestUI extends Activity implements OnClickListener{
    /** Called when the activity is first created. */
  
    private Button button;   
    public mDeleteReceiver mDelete;
    
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.main);
        text = (TextView) findViewById(R.id.textview);
        button=(Button)findViewById(R.id.button);
      
        
        button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent delete = new Intent(Intent.ACTION_DELETE,Uri.parse("package:com.et.TextScroll"));
				startActivity(delete);
								
			}
		});       
    }


	public class mDeleteReceiver extends BroadcastReceiver{

		@Override
		public void onReceive(Context context, Intent intent) {
			// TODO Auto-generated method stub
			Toast.makeText(context, "卸载", Toast.LENGTH_LONG).show();
			Log.i("11111", "22222222222");
		}
		
	}
	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_DATA_CLEARED);
		filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
		filter.addDataScheme("package");
		mDelete = new mDeleteReceiver();
		registerReceiver(mDelete, filter);
		super.onResume();
	}
	/***不能在onPause()注销这个广播，因为跳转到卸载画面时这个activity是pause状态**/
	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		//unregisterReceiver(mDelete);
		super.onPause();
	}
	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		unregisterReceiver(mDelete);
		super.onDestroy();
	}
}