简单对话框1

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本来不打算写这个的很简单可是我调试了好多遍下面把代码附上
就是点击一个按键弹出一个简单对话框

package com.example.main;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Bundle;import android.util.Log;import android.view.View;import android.widget.TextView;public class MainActivity extends Activity {     TextView textview;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);       textview=(TextView) findViewById(R.id.textview);       textview.setOnClickListener(onClick);    }    private View.OnClickListener onClick=new View.OnClickListener() {        @Override        public void onClick(View arg0) {            Dialog alertDialog=new AlertDialog.Builder(MainActivity.this).setTitle("是否删除？").setIcon(R.drawable.ic_launcher).setTitle("是否删除").setPositiveButton("确认", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface arg0, int arg1) {                    new AlertDialog.Builder(MainActivity.this).setMessage("你已经删除该文件").create().show();                }            }).setNegativeButton("取消", new DialogInterface.OnClickListener() {                @Override                public void onClick(DialogInterface arg0, int arg1) {                    new AlertDialog.Builder(MainActivity.this).setMessage("你已经取消删除0删除该文件，删除失败").create().show();                }            }).create();//这必须写create然后在show            //直接写show 有错误            alertDialog.show();        }    };   }

在xml定义一个Textview的id即可

下面是按钮的代码是一样的

package com.example.main66;import android.app.Activity;import android.app.AlertDialog;import android.app.Dialog;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.Toast;public class MainActivity extends Activity {    Button button;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        button =(Button) findViewById(R.id.button);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View arg0) {                Dialog di=new AlertDialog.Builder(MainActivity.this).setTitle("你吃饭了吗")                        .setPositiveButton("确认", new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface arg0, int arg1) {                                // TODO Auto-generated method stub                                new AlertDialog.Builder(MainActivity.this).setMessage("确认").create().show();                                //Toast.makeText(MainActivity.this, "确认", Toast.LENGTH_LONG).show();                            }                        }).setNegativeButton("取消", new DialogInterface.OnClickListener() {                            @Override                            public void onClick(DialogInterface arg0, int arg1) {                                // TODO Auto-generated method stub                                new AlertDialog.Builder(MainActivity.this).setMessage("取消").create().show();                                //Toast.makeText(MainActivity.this, "取消", Toast.LENGTH_LONG).show();                            }                        }).create();                di.show();            }        });    }}

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