Question

我正在尝试制作帮助对话框，它为我的应用用户提供了一些有用的提示。提示应该在@string资源中以处理语言问题。点击时会弹出对话框，其中的文本应该是可滚动的。我目前的实施无法满足这些要求。这是代码：

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import android.text.InputType;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import ch.OptiLab.visuscontroll.R;


public class MainActivity extends Activity implements OnClickListener {

    TextView textView;
    Button buttonende;
    Button tipps;
        Button btn1;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);

          textView = (TextView) findViewById(R.id.textView);
          tipps = (Button) findViewById(R.id.tipps);
            btn1 = (Button) findViewById(R.id.buttonSTART);
            buttonende = (Button) findViewById(R.id.buttonende);
            btn1.setOnClickListener(this);

           tipps.setOnClickListener(new View.OnClickListener(){

            @Override
            public void onClick(View v) {

                // 1. Instantiate an AlertDialog.Builder with its constructor
                AlertDialog.Builder builder = new AlertDialog.Builder (MainActivity.this.getActivity());

                // 2. Chain together various setter methods to set the dialog characteristics
                builder.setMessage(R.string.dialog_message)
                       .setTitle(R.string.dialog_title);

                // 3. Get the AlertDialog from create()
                AlertDialog dialog = builder.create();
            }  
           });

Answer 1

将您的代码更改为

(...)
AlertDialog dialog = builder.create();    
dialog.show(); //Do not forget this line

另外，请确保正确初始化构建器：

AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

尝试点击对话框

1 个答案: