android - finish() 有时无法正常工作

Question

我编写了以下代码来使用 TextView 和按钮显示消息框。单击按钮时， Activity 应该完成。但这有时会起作用，但并不一致。有时它会挂起。如何让它始终如一地工作？请帮忙

public class MyClass extends Activity {
private TextView mText;
private Button mOk;

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

    mText = (TextView) findViewById(R.id.txt);
    mText.setText(“Click ok to exit”);

    mOk = (Button) findViewById(R.id.ok);
    mOk.setOnClickListener(mOnOkClickListener);
}

private final OnClickListener mOnOkClickListener = new OnClickListener() {
    public void onClick(View v) {
        finish();
    }
};

在工作状态下，单击确定按钮时会调用 onPause、onStop 和 onDestroy。挂起时，它只调用 onPause 并挂起。如何让它始终如一地工作？

Answer 1

您可以尝试使用 DialogFragment 制作您的消息。
设置:

//imports you'll need to add:
import android.app.Dialog;
import android.app.AlertDialog;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;

//Activity that fires up your Dialog needs to be a FragmentActivity:        
public class MyActivity extends FragmentActivity {

// ...

//class representing Dialog you want to show
public static class Dialog1 extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage("Click ok to close");
        builder.setPositiveButton("Button text", null);
        return builder.create();
    }
}

执行你的对话:

    DialogFragment df = new Dialog1();
    df.show(getSupportFragmentManager(), "tag");

当然，您可以使用此方法创建更复杂的对话框 - 我们仅使用了 AlertDialog.Builder 中的两个方法，但是 it has much more to offer .