Android UI设计：AlertDialog

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AlertDialog(对话框)

这里写图片描述

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       ad.show();

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

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

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