有关于android弹出框

package com.example.androiddialog1;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends Activity {

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

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

public void onClick(View arg0) {

AlertDialog.Builder builder=new Builder(MainActivity.this);
builder.setTitle("王强");
builder.setPositiveButton("确定", null);
builder.setNegativeButton("取消", null);
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setMessage("王强是坏人了");
builder.show();

}
});

Button btn2=(Button)findViewById(R.id.button2);
btn2.setOnClickListener(new OnClickListener() {

public void onClick(View arg0) {

AlertDialog.Builder builder=new Builder(MainActivity.this);
builder.setTitle("何博中");
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setView(new EditText(MainActivity.this));
builder.setNegativeButton("取消", null);
builder.setPositiveButton("确定", null);
builder.setMessage("xxxxxxx");
builder.show();

}
});

Button btn3=(Button)findViewById(R.id.button3);
btn3.setOnClickListener(new MessageChcek());

//弹出按钮
Button btn4=(Button)findViewById(R.id.button4);
btn4.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {

AlertDialog.Builder builder=new Builder(MainActivity.this);
builder.setTitle("xxxx");
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setSingleChoiceItems(new String[]{"item1","item2","item3","item4"},
0,
new DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog, int which){

dialog.dismiss();
} });
builder.setNegativeButton("取消", null);
builder.show();

}
});

//弹出多选
Button btn5=(Button)findViewById(R.id.btndialog);
btn5.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View arg0) {
AlertDialog.Builder builder=new Builder(MainActivity.this);
builder.setTitle("mulitle");
builder.setIcon(android.R.drawable.ic_dialog_info);
builder.setMultiChoiceItems(new String[]{"item1","item2","item3","item4"},null, null);
builder.setNegativeButton("取消", null);
builder.show();

}
});

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

private final class MessageChcek implements View.OnClickListener
{

@Override
public void onClick(View v) {

Intent intent=new Intent();
intent.putExtra("names", "123456");
intent.setClass(MainActivity.this, CheckActive.class);
startActivity(intent);
MainActivity.this.finish();

}

}

}

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