在一个Android应用程序中启动另一个程序（微信）

     其实很简单，只是几句代码

    try { 

if((MyActivity.this.getPackageManager().getPackageInfo("com.tencent.mm", 64)) == null)

{

Toast.makeText(MyActivity.this, "微信未安装！", Toast.LENGTH_SHORT).show();

return;

}

} catch (NameNotFoundException e1) {

// TODO Auto-generated catch block

e1.printStackTrace();

Toast.makeText(MyActivity.this, "微信未安装！", Toast.LENGTH_SHORT).show();

return;

}

        try {

        MyActivity.this.startActivity(MyActivity.this.getPackageManager().getLaunchIntentForPackage("com.tencent.mm"));//打开微信，com.tencent.mm是微信的包名

        Log.i(TAG, "start weixin");

} catch (Exception e) {

// TODO: handle exception

Toast.makeText(MyActivity.this, "请检查是否安装微信！", Toast.LENGTH_SHORT).show();

}