从一个应用打开另一个应用

Intent intent = mContext.getPackageManager()
      .getLaunchIntentForPackage(“应用包名”);

    if(intent==null){
     AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
        builder.setTitle("温馨提示:")
        .setMessage("您未安装该应用,请先安装后再打开!");
              builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
                  public void onClick(DialogInterface dialog, int whichButton) {
                      //这里添加点击确定后的逻辑
                  }
              });
              builder.create().show();
     return;
    }
    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    startActivity(intent);