Android：dialog选项功能的实现

准备：

一，实现弹出文本框选择

样式如下：

2.java代码如下：

import android.content.DialogInterface;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class Main4Activity extends AppCompatActivity {
    private Button dialog;
    AlertDialog.OnClickListener clickListener=new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            switch (which){
                case DialogInterface.BUTTON_NEGATIVE:
                    Toast.makeText(Main4Activity.this, "不开心", Toast.LENGTH_SHORT).show();
                    break;
                case DialogInterface.BUTTON_POSITIVE:
                    Toast.makeText(Main4Activity.this, "开心", Toast.LENGTH_SHORT).show();
                    break;
                case DialogInterface.BUTTON_NEUTRAL:
                    Toast.makeText(Main4Activity.this, "一般", Toast.LENGTH_SHORT).show();
                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main4);
        dialog= (Button) findViewById(R.id.alert);
        dialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
                builder.setTitle("心情")
                        .setMessage("你今天开心么？")
                        .setNegativeButton("不开心",clickListener)
                        .setPositiveButton("开心",clickListener)
                        .setNeutralButton("一般",clickListener);
                builder.show();

            }
        });

    }
}

3.实现设置样式

方法一：编写样式文件

在该文件中加样式

悬浮效果

修改语句

方法二：通过java代码去修改样式

   //2.通过java代码去修改样式
                //保证dialog已经可以成功显示
                AlertDialog ad = builder.create();
                ad.show();

               Window w =  ad.getWindow();//先去获得dialog所在的窗体
                WindowManager wm =  w.getWindowManager();//取得窗体的管理权限
                Display d = wm.getDefaultDisplay();//得到手机屏幕窗体的宽和高
                WindowManager.LayoutParams lp = w.getAttributes();//获得dialog的宽和高
                lp.height = (int) (d.getHeight()*0.6);
                lp.gravity = Gravity.BOTTOM;
                w.setAttributes(lp);

方法三：自己编写页面布局来弹出

 builder.setView(R.layout.a);
                builder.show();

二，下拉选择

java代码如下：

 private Button select;
    private String[] positives={"好看","好看","真好看"};
 select= (Button) findViewById(R.id.select);
        select.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
                builder.setTitle("优点呢？")
                       .setItems(positives, new DialogInterface.OnClickListener() {
                           @Override
                           public void onClick(DialogInterface dialog, int which) {
                               Toast.makeText(Main4Activity.this, positives[which], Toast.LENGTH_SHORT).show();
                           }
                       });
                builder.show();
            }
        });

效果如图：

三，单项选择

java代码如下：

private Button radio;
 radio= (Button) findViewById(R.id.radio);
        radio.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
                builder.setTitle("只能选一个哟~")
                        .setSingleChoiceItems(positives, 1, new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                Toast.makeText(Main4Activity.this, positives[which], Toast.LENGTH_SHORT).show();
                            }
                        });
                builder.show();
            }
        });

效果如图：

四，多项选择

java代码如下：

 private Button ck;
    private String[] positives={"好看","好看","真好看"};
    ck= (Button) findViewById(R.id.ck);
        ck.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder builder=new AlertDialog.Builder(Main4Activity.this);
                builder.setTitle("可以选很多个哟~~")
                        .setMultiChoiceItems(positives, new boolean[]{true, false, true}, new DialogInterface.OnMultiChoiceClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                                Toast.makeText(Main4Activity.this, positives[which], Toast.LENGTH_SHORT).show();
                            }
                        });
                builder.show();
            }
        });

效果如图：