使用AlertDialog创建对话框
(1)创建AlertDialog.Builder对象
(2)调用AlertDialog.Builder的setTitle()或setCustomTitle()设置标题,setIcon设置图片
(3)调用AlertDialog.Builder的相关方法设置对话框内容
setMessage():简单文本内容
setItems():简单列表项
setSingleChoiceItems():内容为单选列表
setMultiChoiceItems():内容为多选列表项
setAdapter():自定义列表项
setView():自定义View
(4)调用AlertDialog.Builder的setPositiveButton(),setNegativeButton()或setNeutralButton()添加多个按钮
(5)调用AlertDialog.Builder的create()方法创建AlertDialog对象,再用AlertDialog的show()将对话框显示出来
例子:
package com.example.maiyu.my1; import android.app.AlertDialog; import android.content.DialogInterface; import android.content.Intent; import android.support.v7.app.ActionBarActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.Toast; public class MainActivity extends ActionBarActivity {
private Button register,register1,register2,register3,register4,register5; @Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); register2.setOnClickListener(new View.OnClickListener() {
@Override public void onClick(View v) {
Intent intent = new Intent(MainActivity.this , SimpleAlertDialog.class); startActivity(intent); }
}); }
private void initView() {
register = (Button)findViewById(R.id.register); register1 = (Button)findViewById(R.id.register1); register2 = (Button)findViewById(R.id.register2); register3 = (Button)findViewById(R.id.register3); register4 = (Button)findViewById(R.id.register4); register5 = (Button)findViewById(R.id.register5); }
//(2)这是注册1的实现方法 public void Second1(View v){
//通过intent来启动第二个类 Intent intent = new Intent(); //调用intent的setClass方法,这里传入两个参数,当期类.this , 启动的类.class intent.setClass(MainActivity.this , SimpleAlertDialog.class); //调用startActivity(意图对象)启动 startActivity(intent); }
//(1)以下是注册按钮的实现方法 public void Second(View source){
//(1)创建AlertDialog.Builder对象 AlertDialog.Builder builder = new AlertDialog.Builder(this); //(2)设置对话框标题和图标 builder.setTitle("注册界面"); builder.setIcon(R.drawable.tools); //设置对话框的测试内容 builder.setMessage("你真是个萨比,\n这难道不是真的?\n没错,就是"); //(3)为AlertDialog.Builder添加按钮 setPositiveButton(builder); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
Toast.makeText(MainActivity.this , "您取消了啦啦!" , Toast.LENGTH_SHORT).show(); }
}); //(4)调用AlertDialog.Builder的create()创建AlertDialog对象,再调用AlertDialog对象的show()方法 //将对话框显示出来 builder.create(); builder.show(); }
private AlertDialog.Builder setPositiveButton(final AlertDialog.Builder builder){
//调用setPositiveButton为方法添加”确定“按钮 return builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
register.setText("你点击了确定"); }
}); }
}
package com.example.maiyu.my1; import android.app.Activity; import android.app.AlertDialog; import android.content.DialogInterface; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; /** * Created by maiyu on 2016/4/17. */ public class SimpleAlertDialog extends Activity {
TextView textView ; @Override protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState); setContentView(R.layout.login); //setContentView(R.layout.activity_main); textView = (TextView)findViewById(R.id.textView1); simple(); }
//根据传入的View对象来创建对话框 private void simple() {
//(1)创建AlertDialog.Builder对象 AlertDialog.Builder builder = new AlertDialog.Builder(this); //(2)设置对话框标题和图标 builder.setTitle("简单列表对话框"); builder.setIcon(R.drawable.tools); //设置简单的列表项内容 final String[] items = new String[]{"疯狂", "白痴" ,"你妹"}; builder.setItems(items, new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
textView.setText("你选中了<<" + items[which] + ">>"); }
}); //(3)为AlertDialog.Builder添加按钮 setPositiveButton(builder); builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
}
}); //(4)调用AlertDialog.Builder的create()创建AlertDialog对象,再调用AlertDialog对象的show()方法 //将对话框显示出来 builder.create(); builder.show(); }
private AlertDialog.Builder setPositiveButton(final AlertDialog.Builder builder){
//调用setPositiveButton为方法添加”确定“按钮 return builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
@Override public void onClick(DialogInterface dialog, int which) {
}
}); }
}
解释:
在AndroidManifest注册:
<activity android:name=".SimpleAlertDialog"></activity>
这里:
用三种方式为按钮添加监听器:
(1)在XML中增加:
android:onClick="Second"
当我们按下按钮Second时,就会调用方法public void Second();
(2)同理,不过在方法Second1()中通过意图启动另一个类,需注册
(3)直接设置监听器,不调用android:onClick属性,
另外:
确定按钮和取消按钮这里也用不同方式,为了更理解