如何从AlertDialog获得结果?

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我使用AlertDialog.Builder来显示对话框,提示用户输入密码,然后我想要将密码保存在首选项中,但是无法从警报对话框的输入方法中获得结果。

以下是我想要做的事情:

    String result;
    AlertDialog.Builder b = new AlertDialog.Builder(this);
    b.setTitle("Please enter a password");
    final EditText input = new EditText(this);
    b.setView(input);
    b.setPositiveButton("OK", new DialogInterface.OnClickListener()
    {
        @Override
        public void onClick(DialogInterface dialog, int whichButton)
        {
           //I get a compile error here, it wants result to be final.
           result = input.getText().toString();
        }
    });
    b.setNegativeButton("CANCEL", null);
    b.create().show();

然而,我愿意做这样的事情showDialog(int);然后使用onCreateDialog(int)方法,并以某种方式设置结果并在其他方法中接收,但我不知道如何处理最后一部分。

提问于
用户回答回答于
public class MyActivity extends Activity {
    private String result;

    void showDialog() {
        AlertDialog.Builder b = new AlertDialog.Builder(this);
        b.setTitle("Please enter a password");
        final EditText input = new EditText(this);
        b.setView(input);
        b.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int whichButton) {
                result = input.getText().toString();
            }
        });
        b.setNegativeButton("CANCEL", null);
        b.show();
    }
}
用户回答回答于

简化示例:

public interface TextListener {
    void onPositiveResult(CharSequence text);
}

public static AlertDialog getTextDialog(Context ctx,
        final TextListener listener) {
    View view = LayoutInflater.from(ctx).inflate(R.layout.dialog, null);
    final TextView tv = (TextView) view.findViewById(R.id.tv);
    AlertDialog.Builder builder = new AlertDialog.Builder(ctx);
    builder.setView(view);
    //
    builder.setPositiveButton(android.R.string.ok, new OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            listener.onPositiveResult(tv.getText());
        }
    });
    builder.setNegativeButton(android.R.string.cancel, null);
    return builder.create();
}

-编辑--或者你试试这个代码:

 public class Main extends Activity {
    private Button btn;
    private String result;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        btn = (Button) findViewById(R.id.button1);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                showDialog(0);
            }
        });
    }

    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case 0:
            final EditText input = new EditText(this);

            return new AlertDialog.Builder(this)
            .setIcon(R.drawable.icon)
            .setTitle("Please enter a password")
            .setView(input)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int whichButton) {
                    Toast.makeText(getBaseContext(), input.getText().toString(), Toast.LENGTH_SHORT).show();
                }
            })
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int whichButton) {
                    Toast.makeText(getBaseContext(), "Cancel clicked!", Toast.LENGTH_SHORT).show();
                }
            }).create();
        }

        return null;
    }
}

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