Android 把APP从后台调到前台_intent无法将app拉到前台

APP从后台调到前台

Intent intent = new Intent("android.intent.action.MAIN");
intent.setComponent(new ComponentName(getApplicationContext().getPackageName(), MainActivity.class.getName()));
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
getApplicationContext().startActivity(intent);
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打开APP

private void openAPP(String appPackageName){
    try{
        //如果有，直接打开
        Intent intent = this.getPackageManager().getLaunchIntentForPackage(appPackageName);
        startActivity(intent);
    }catch(Exception e){
        Toast.makeText(this, "没有安装", Toast.LENGTH_LONG).show();
    }
}
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