問題描述

我有一個 EditText-Field 并為其設置了 OnFocusChangeListener.當它失去焦點時，會調用一個方法，該方法將 EditText 的值與數據庫中的一個進行檢查.如果該方法的返回值為 true，則會顯示一個 toast，并且焦點應該再次回到 EditText 上.焦點應該總是回到 EditText 并且鍵盤應該顯示，直到方法的返回值為 false.

I have an EditText-Field and set an OnFocusChangeListener for it. When it has lost focus, a method is called, which checks the value of the EditText with one in the database. If the return-value of the method is true, a toast is shown and the focus should get back on the EditText again. The focus should always get back on the EditText and the keyboard should show, until the return-value of the method is false.

我想，我的真正問題還沒有完全清楚:屏幕上沒有其他項目應該能夠編輯，直到 EditText 的值被編輯為一個值，這使得方法checkLiganame(liganame)" 返回 false.只有 EditText-Field 應該是可編輯的.

I think, I haven't made my real problem perfectly clear yet: No other Item on the Screen should be able to edit, until the value of the EditText is edited to a value, which makes the method "checkLiganame(liganame)" return false. Only the EditText-Field should be editable.

這是我的代碼(對我不起作用):

here is my code (which doesn't work for me):

final EditText Liganame = (EditText) findViewById(R.id.liganame);

    Liganame.setOnFocusChangeListener(new OnFocusChangeListener() {

        @Override
        public void onFocusChange(View v, boolean hasFocus) {
            if (!hasFocus) {

                String liganame = Liganame.getText().toString();


                if (checkLiganame(liganame)) {
                    Toast toast = Toast.makeText(CreateTableActivity.this,
                            "Dieser Liganame ist bereits vergeben",
                            Toast.LENGTH_SHORT);
                    toast.show();
                    Liganame.requestFocus();
                }
            }

以及方法:

public boolean checkLiganame(String liganame) {
    boolean found = false;

    DatabaseHelper databaseHelper = new DatabaseHelper(this);
    SQLiteDatabase db = databaseHelper.getReadableDatabase();

    Cursor cursor = db.query("liga", new String[] { "liganame" },
            "liganame = '" + liganame + "'", null, null, null, null);
    Log.i("Liganame: ", String.valueOf(cursor));

    db.close();
    if (cursor != null) {
        found = true;
    }

    return found;
}

這段代碼導致如下結果:EditText失去焦點后，焦點跳回EditText，但我不能再編輯文本了.

This code leads to the following result: After the EditText has lost focus, the focus jumps back to EditText, but I can't edit the text anymore.

更改了我的代碼.場景:

Changed my code. Scenario:

我單擊第一個 EditText 并將一個字符串放入其中，該字符串已在數據庫中.吐司正在展示.現在我不能再編輯我的字符串了.我單擊鍵盤上的下一步"，焦點停留在第一個 EditText 上.我嘗試編輯我的字符串，但沒有任何反應.相反，我的新字符串顯示在第二個 EditText 中.我單擊設備的后退箭頭，然后重新單擊第一個和第二個 EditText --> 沒有顯示鍵盤.

I click on the first EditText and put a String in it, which is already in the database. The toast is showing. Now I can't edit my String anymore. I click "next" on the keyboard and the focus stays on the first EditText. I try to edit my String, but nothing happens. Instead my new String is showing in the second EditText. I click on the back-arrow of my device and reclick on the first and second EditText --> no keyboard is showing.

這是我的新代碼:

public class CreateTableActivity extends Activity implements
    OnFocusChangeListener {

private EditText Liganame, Mannschaftsanzahl;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.create_league);

    Liganame = (EditText) findViewById(R.id.liganame);
    Liganame.setOnFocusChangeListener(this);
    Mannschaftsanzahl = (EditText) findViewById(R.id.mannschaftsanzahl);
    Mannschaftsanzahl.setOnFocusChangeListener(this);

    final Button save_button = (Button) findViewById(R.id.create_tabelle_speichern_button);

    OnClickListener mCorkyListener = new OnClickListener() {
        public void onClick(View v) {
            ButtonClick();
        }
    };
    save_button.setOnClickListener(mCorkyListener);



}

@Override
public void onFocusChange(View v, boolean hasFocus) {
    String liganame = Liganame.getText().toString();

    if (checkLiganame(liganame)) {
        if (Liganame.requestFocus()) {
            getWindow()
                    .setSoftInputMode(
                            WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
            Mannschaftsanzahl.clearFocus();
            Toast.makeText(CreateTableActivity.this,
                    "Dieser Liganame ist bereits vergeben",
                    Toast.LENGTH_SHORT).show();
        }
    }
}

推薦答案

只要把這一行放在你的 onCreate()

Just put this line on your onCreate()

editText.requestFocus();

這篇關于在 EditText 上設置焦點的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！