在 EditText 上设置焦点 [英] Set Focus on EditText

问题描述

我有一个 EditText-Field 并为其设置了 OnFocusChangeListener.当它失去焦点时，会调用一个方法，该方法将 EditText 的值与数据库中的一个进行检查.如果该方法的返回值为 true，则会显示一个 toast，并且焦点应该再次回到 EditText 上.焦点应该总是回到 EditText 并且键盘应该显示，直到方法的返回值为 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，我的真正问题还没有完全清楚:屏幕上没有其他项目应该能够编辑，直到 EditText 的值被编辑为一个值，这使得方法checkLiganame(liganame)" 返回 false.只有 EditText-Field 应该是可编辑的.

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.

这是我的代码(对我不起作用):

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;
}

这段代码导致如下结果:EditText失去焦点后，焦点跳回EditText，但我不能再编辑文本了.

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.

更改了我的代码.场景:

Changed my code. Scenario:

我单击第一个 EditText 并将一个字符串放入其中，该字符串已在数据库中.吐司正在展示.现在我不能再编辑我的字符串了.我单击键盘上的下一步"，焦点停留在第一个 EditText 上.我尝试编辑我的字符串，但没有任何反应.相反，我的新字符串显示在第二个 EditText 中.我单击设备的后退箭头，然后重新单击第一个和第二个 EditText --> 没有显示键盘.

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.

这是我的新代码:

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();
        }
    }
}

推荐答案

只要把这一行放在你的 onCreate()

Just put this line on your onCreate()

editText.requestFocus();

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