Activity 启动后自动弹出软键盘

launch-softinput-after-activity-start.java

@Override
protected void onResume() {
    super.onResume();

    final Handler handler = new Handler(Looper.getMainLooper()) {
        @Override
        public void handleMessage(Message msg) {
            EditText et = (EditText) findViewById(android.R.id.text1);
            et.requestFocus();
            InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.showSoftInput(et, 0);
            et.setSelection(et.getText().toString().length());
        }
    };

    // 调用 showSoftInput() 可能会因为界面没彻底加载完而弹出失败。所以延迟一段时间后调用保证软键盘弹出成功。
    Timer timer = new Timer();
    timer.schedule(
            new TimerTask() {
                public void run() {
                    handler.sendEmptyMessage(0);
                }

            }, 500);
}