提示框

1.  简单的布局文件 activity_main.xml   

<EditText
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/mytext"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="60dp"
    android:text="hello" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="delete"
    android:id="@+id/mybutton"
    android:layout_below="@+id/mytext"
    android:layout_centerHorizontal="true"
    android:layout_marginTop="55dp" />

2.MainActivity

public class MainActivity extends AppCompatActivity {
        private Button mybutton = null;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            this.mybutton = (Button)super.findViewById(R.id.mybutton);
            this.mybutton.setOnClickListener(new OnClickListenerImp());


        }

    private class OnClickListenerImp  implements OnClickListener {
        @Override
        public void onClick(View v) {
            Dialog dialog = new AlertDialog.Builder(MainActivity.this)
                    .setTitle("delete?")  //设置标题
                    .setMessage("Are you sure to delete this message")  //显示信息
                    .setPositiveButton("delete",  //增长一个肯定按钮
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {   //单击事件
                                }
                            })
                    .setNeutralButton("see more",   //增长普通按钮
                            new DialogInterface.OnClickListener() {   //设置监听操做
                                @Override
                                public void onClick(DialogInterface dialog, int which) {   //单击事件
                                }
                            })
                    .setNegativeButton("cancle",   //增长取消按钮
                            new DialogInterface.OnClickListener() {
                                @Override
                                public void onClick(DialogInterface dialog, int which) {   //单击事件
                                }
                            })
                    .create();   //建立Dialog
                    dialog.show(); //显示对话框
                            }
        }
}