安卓3_弹窗AlertDialog

俗话说 实践出真知 所以 就直接上代码啦

1、activity_main.xml

很基础 没什么好说的 顺着写就好

主界面.jpg

2、MainActivity.java

这里展示了5种弹窗(对话框) 的用法 但是大同小异
PS: 刚开始准备写在一起 但是太丑了 我都看不下去 还是分开展示吧 好气哦

0)主体

public class MainActivity extends AppCompatActivity {
    private final Context context = MainActivity.this;
    private Button button1;
    private Button button2;
    private Button button3;
    private Button button4;
    private Button button5;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        button1 = findViewById(R.id.button1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click1();
            }
        });

        button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click2();
            }
        });

        button3 = findViewById(R.id.button3);
        button3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click3();
            }
        });

        button4 = findViewById(R.id.button4);
        button4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click4();
            }
        });

        button5 = findViewById(R.id.button5);
        button5.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                click5();
            }
        });
    }
}

1)普通对话框

public void click1(){
    //new一个建立弹窗模板的方法
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("基础弹窗");
    builder.setMessage("弹窗是否显示成功？");
    builder.setNegativeButton("否", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(context, "啊 这。。。", Toast.LENGTH_SHORT).show();
        }
    });
    builder.setPositiveButton("是", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(context, "弹窗显示成功", Toast.LENGTH_SHORT).show();
        }
    });
    builder.show();
}

普通对话框展示.jpg

2)单选对话框

public void click2(){
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("请选择你最喜欢的选项");
    final String items[] = {"A","B","C","D","E"};
    builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            String item = items[which];
            Toast.makeText(getApplicationContext(),"你选择了：" + item.toString(),Toast.LENGTH_SHORT).show();
            dialog.dismiss();
        }
    });
    builder.show();
}

单选对话框展示.jpg

3)多选对话框

public void click3(){
    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setTitle("今天做了什么?");
    final String items[] = {"吃饭","学习","睡觉","打豆豆"};
    final boolean[] checkedItems = {false,true,false,false};
    builder.setMultiChoiceItems(items, checkedItems, new DialogInterface.OnMultiChoiceClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which, boolean isChecked) {}
    });
    builder.setPositiveButton("我选好了", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            StringBuffer sb = new StringBuffer();
            for (int i = 0; i < checkedItems.length; i++) {
                if(checkedItems[i]){
                String option = items[i];
                sb.append(option + " ");
            }
        }
        Toast.makeText(getApplicationContext(),"今天去 " + sb.toString() + "了",Toast.LENGTH_SHORT).show();
            dialog.dismiss();
        }
    });
    builder.show();
}

多选对话框.jpg

4)加载进度条

public void click4(){
    final ProgressDialog dialog = new ProgressDialog(context);
    dialog.setTitle("任务加载中...");
    dialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);

    new Thread(){ //创建一个子线程
        public void run(){
            dialog.setMax(100);
            for (int i = 0; i <= 100; i++) {
                dialog.setProgress(i);
                SystemClock.sleep(50);
            }
            dialog.dismiss();
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    Toast.makeText(getApplicationContext(),"加载成功",Toast.LENGTH_SHORT).show();
                    //可以同时设置多个view 或者发生消息（只允许运行在主线程的操作）
                    //安卓中的主线程叫UI线程 一个activity只允许有一个
                }
            });
        }
    }.start();
    dialog.show();
}

加载进度条展示.jpg

5)自定义弹窗

public void click5(){
    //new一个弹窗 并绑定布局
    View view1 = View.inflate(context,R.layout.layout_one,null);
    AlertDialog dialog = new AlertDialog.Builder(context)
        .setView(view1)
        .create();//只有这个方法的返回类型是 AlertDialog

    TextView textView = view1.findViewById(R.id.text1);
    //textView.setText("haha world!");
    dialog.setCanceledOnTouchOutside(false);//触摸旁边不会消失，但返回键会消失
    //dialog.setCancelable(false);//都不会消失
    dialog.show();        
}

自定义弹窗展示.jpg

3、layout_one.xml

这个就是写自定义弹窗的布局
PS: 鉴于本人水平太菜了 有些布局就强行加空格写的 哈哈哈哈偷懒了偷懒了

大概就这么多了吧 还是那句话 实践出真知! and 笔记都在注释里!