AlertDialog(对话框)

一、用法

首先通过AlertDialog.Builder创建出一个AlertDialog的实例
然后可以为这个对话框设置标题、内容、可否取消等属性。

//创建builder
       AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
       //设置图标、标题、内容、取消、确定等按钮
       builder.setIcon(R.mipmap.ic_launcher);
       builder.setTitle("我是一个标题");
       builder.setMessage("我是内容");
       builder.setNegativeButton("NegativeButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NegativeButton",Toast.LENGTH_SHORT).show();
           }
       });
       builder..setNeutralButton("NeutralButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NeutralButton",Toast.LENGTH_SHORT).show();
           }
       });
       builder.setPositiveButton("PositiveButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"PositiveButton",Toast.LENGTH_SHORT).show();
           }
       });
       //AlertDialog对象
       AlertDialog ad=builder.create();
       //显示

二、实例

实例一：普通用法，弹出普通alerdialog，跟上面用法的介绍相同

public void show(){

       AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
       builder.setIcon(R.mipmap.ic_launcher).setTitle("我是一个标题").setMessage("我是内容").setNegativeButton("NegativeButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NegativeButton",Toast.LENGTH_SHORT).show();
           }
       }).setNeutralButton("NeutralButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NeutralButton",Toast.LENGTH_SHORT).show();
           }
       }).setPositiveButton("PositiveButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"PositiveButton",Toast.LENGTH_SHORT).show();
           }
       });
       AlertDialog ad=builder.create();
       ad.show();

   }

实例二：弹出单选框的Dialog，调用builder.setSingleChoiceItems(msexs, 0, new DialogInterface.OnClickListener() {});(匿名内部类)

加上取消与确定按钮

public  void singleselect(){
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setSingleChoiceItems(msexs, 0, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                sex=msexs[which];
            }
        });
        builder.setNeutralButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                Toast.makeText(getApplicationContext(), "您的性别是" + sex, Toast.LENGTH_SHORT).show();
                mBtn2.setText("您的性别是"+sex);
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                sex="您没有进行性别选择";
                Toast.makeText(getApplicationContext(), sex, Toast.LENGTH_SHORT).show();
            }
        });
        AlertDialog ad=builder.create();
        ad.show();
    }

实例三：多选框Dialog，调用 builder.setMultiChoiceItems(hobbys, mIscheckedHobby, new DialogInterface.OnMultiChoiceClickListener()});

public void multiselect(){
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setMultiChoiceItems(hobbys, mIscheckedHobby, new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
            //which代表选中的是哪个
                mIscheckedHobby[which]=isChecked;

            }
        });
        builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                for (int i = 0; i <hobbys.length ; i++) {
                    if(mIscheckedHobby[i]){
                        hobby.append(hobbys[i]);
                    }
                }
                Toast.makeText(getApplicationContext(),"您的爱好是"+hobby,Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNeutralButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int

实例四：可点击Dialog，调用builder.setItems(mData,new DialogInterface.OnClickListener() {});

private void enableselect() {
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setItems(mData,new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
            //which是从0开始的
                which=which+1;
                Toast.makeText(getApplicationContext(),"选中了第"+which+"个",Toast.LENGTH_SHORT).show();
            }
        });
        AlertDialog ad=builder.create();
        ad.show();

    }

完整代码：

布局：四个按钮

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
    android:orientation="vertical">
<Button
    android:id="@+id/button"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="弹出一个Dialog"/>
    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="弹出一个单选Dialog"/>
    <Button
        android:id="@+id/button3"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="弹出一个多选Dialog"/>
    <Button
        android:id="@+id/button4"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="弹出一个可选择的Dialog"/>

</LinearLayout>

MainActivity：

public class MainActivity extends Activity implements View.OnClickListener{
    private Button mBtn;
    private Button mBtn2;
    private Button mBtn3;
    private Button mBtn4;
    private String[] msexs={"男","女","其他"};
    private String sex;
    private String[] hobbys={"篮球","看书","跑步","羽毛球","画画"};
    private boolean[] mIscheckedHobby;
    private StringBuffer hobby=new StringBuffer();
    private String[] mData={"第一个可点击","第二个可点击","第三个可点击","第四个可点击"};

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mIscheckedHobby=new boolean[hobbys.length];
        mBtn= (Button) findViewById(R.id.button);
        mBtn2=(Button) findViewById(R.id.button2);
        mBtn3=(Button) findViewById(R.id.button3);
        mBtn4=(Button) findViewById(R.id.button4);
        mBtn.setOnClickListener(this);
        mBtn2.setOnClickListener(this);
        mBtn3.setOnClickListener(this);
        mBtn4.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.button:{
                show();
                break;
            }
            case R.id.button2:{
                singleselect();
                break;
            }
            case R.id.button3:{
                multiselect();
                break;
            }
            case R.id.button4:{
               enableselect();
                break;
            }
            default:break;
        }

    }

    private void enableselect() {
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setItems(mData,new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                which=which+1;
                Toast.makeText(getApplicationContext(),"选中了第"+which+"个",Toast.LENGTH_SHORT).show();
            }
        });
        AlertDialog ad=builder.create();
        ad.show();

    }


    public void show(){

       AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
       builder.setIcon(R.mipmap.ic_launcher).setTitle("我是一个标题").setMessage("我是内容").setNegativeButton("NegativeButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NegativeButton",Toast.LENGTH_SHORT).show();
           }
       }).setNeutralButton("NeutralButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"NeutralButton",Toast.LENGTH_SHORT).show();
           }
       }).setPositiveButton("PositiveButton", new DialogInterface.OnClickListener() {
           @Override
           public void onClick(DialogInterface dialog, int which) {
               Toast.makeText(getApplicationContext(),"PositiveButton",Toast.LENGTH_SHORT).show();
           }
       });
       AlertDialog ad=builder.create();
       ad.show();

   }
    public  void singleselect(){
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setSingleChoiceItems(msexs, 0, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                sex=msexs[which];
            }
        });
        builder.setNeutralButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                Toast.makeText(getApplicationContext(), "您的性别是" + sex, Toast.LENGTH_SHORT).show();
                mBtn2.setText("您的性别是"+sex);
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                sex="您没有进行性别选择";
                Toast.makeText(getApplicationContext(), sex, Toast.LENGTH_SHORT).show();

            }
        });
        AlertDialog ad=builder.create();
        ad.show();

    }
    public void multiselect(){
        AlertDialog.Builder builder=new AlertDialog.Builder(MainActivity.this);
        builder.setMultiChoiceItems(hobbys, mIscheckedHobby, new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                mIscheckedHobby[which]=isChecked;

            }
        });
        builder.setNegativeButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                for (int i = 0; i <hobbys.length ; i++) {
                    if(mIscheckedHobby[i]){
                        hobby.append(hobbys[i]);
                    }
                }
                Toast.makeText(getApplicationContext(),"您的爱好是"+hobby,Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNeutralButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int