117笔记问答打开activity的方法有以下几种：
- 使用显式Intent打开目标Activity：
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class); startActivity(intent);
- 使用隐式Intent打开目标Activity：
Intent intent = new Intent();
intent.setAction("com.example.ACTION_TARGET_ACTIVITY");
startActivity(intent);
- 使用Intent传递数据到目标Activity：
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class);
intent.putExtra("key", value);
startActivity(intent);
- 使用startActivityForResult()方法打开目标Activity，并获取返回结果：
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class); startActivityForResult(intent, REQUEST_CODE);
- 使用FLAG_ACTIVITY_NEW_TASK标记打开目标Activity：
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class); intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); startActivity(intent);
- 使用PendingIntent打开目标Activity：
Intent intent = new Intent(CurrentActivity.this, TargetActivity.class); PendingIntent pendingIntent = PendingIntent.getActivity(CurrentActivity.this, requestCode, intent, PendingIntent.FLAG_UPDATE_CURRENT); pendingIntent.send();