安卓学习-界面-ui-对话框

public class MainActivity extends Activity {

    String[] items=new String[]{"苹果","鸭梨","桔子","香蕉"};
    
    @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 v) {
                    AlertDialog d=new AlertDialog.Builder(MainActivity.this)
                    .setTitle("水果列表")
                    //图标
                    .setIcon(R.drawable.ic_launcher)
                    .setItems(items, new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(MainActivity.this, items[which], Toast.LENGTH_SHORT).show();                            
                        }
                    })
                    .setNeutralButton("我知道了", new DialogInterface.OnClickListener() {
        
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(MainActivity.this,"我知道了", Toast.LENGTH_SHORT).show();    
                        }
                    })
                    .create();
                d.show();
            }
        });
    }
}

public class MainActivity extends Activity {

    int selIndex=0;
    String[] items=new String[]{"苹果","鸭梨","桔子","香蕉"};
    
    @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 v) {
                    AlertDialog d=new AlertDialog.Builder(MainActivity.this)
                    .setTitle("请选择")
                    //图标
                    .setIcon(R.drawable.ic_launcher)
                    .setSingleChoiceItems(items, selIndex, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            selIndex=which;
                            Toast.makeText(MainActivity.this, "你选择的是："+items[which], Toast.LENGTH_SHORT).show();            
                        }
                    })
                    .setNeutralButton("确定", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(MainActivity.this,"确定，选择的的是"+items[selIndex], Toast.LENGTH_SHORT).show();    
                        }
                    })
                    .setPositiveButton("取消", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(MainActivity.this,"取消", Toast.LENGTH_SHORT).show();    
                        }
                    })
                    .create();
                d.show();
            }
        });
    }
}

public class MainActivity extends Activity {

    int selIndex=0;
    String[] items=new String[]{"苹果","鸭梨","桔子","香蕉"};
    boolean[] selItems=new boolean[]{false,false,true,true};
    
    @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 v) {
                    AlertDialog d=new AlertDialog.Builder(MainActivity.this)
                    .setTitle("请选择")
                    //图标
                    .setIcon(R.drawable.ic_launcher)
                    .setMultiChoiceItems(items,selItems, new DialogInterface.OnMultiChoiceClickListener() {
                        public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                            if(isChecked){
                                Toast.makeText(MainActivity.this, "你选择了："+items[which], Toast.LENGTH_SHORT).show();
                                selItems[which]=isChecked;
                            }
                        }
                    })
                    .setNeutralButton("确定", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            String str="";
                            for(int i=0;i<selItems.length;i++){
                                if(selItems[i]){
                                    str=str+items[i]+",";
                                }
                            }
                            Toast.makeText(MainActivity.this,"确定，选择的的是"+str, Toast.LENGTH_SHORT).show();    
                        }
                    })
                    .setPositiveButton("取消", new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            Toast.makeText(MainActivity.this,"取消", Toast.LENGTH_SHORT).show();    
                        }
                    })
                    .create();
                d.show();
            }
        });
    }
}