Android的界面提醒之对话框Dialog

Android的界面提醒包括：吐司，对话框等

吐司就比较常见了，调用Toast类的API即可达到

重点就是对话框，对话框在Android中的界面提醒中有很重要的运用：

1.确定取消对话框

在这里有个问题，就是在创建AlertDialog内部类Builder的时候需要传入一个上下文的对象，这里不能使用getApplicationContext()，而必须使用Activity,因为只有一个Activity才能添加一个窗体。 不然会报异常。

  public void onClick1(View v)
    {
        //对话框构建器
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        //三项必设置
        builder.setTitle("确定取消对话框");
        builder.setIcon(R.mipmap.ic_launcher);
        builder.setMessage("确定取消对话框内容");
        //确定按钮
        builder.setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "点击确定", Toast.LENGTH_SHORT).show();
            }
        });
        builder.setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "点击取消", Toast.LENGTH_SHORT).show();
            }
        });
        //通过构建者获得对话框对象
        AlertDialog dialog = builder.create();
        dialog.show();
    }

2.单选对话框

   /**
     * 创建单选的对话框 singleChoiceItems
     * @param v
     */
    public void onClick2(View v)
    {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("选择性别");
        final String[] items = {"男","女","其它"};
        //-1表示不做默认的选择
        builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                Toast.makeText(MainActivity.this, "点击了"+items[which], Toast.LENGTH_SHORT).show();
                dialog.dismiss();
            }
        });
        builder.show();
    }

3.多单选对话框

  /**
     * 多选对话框
     *
     * @param v
     */
    public void onClick3(View v) {
        AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
        builder.setTitle("选择你爱吃的东西");
        final String[] items = {"苹果", "香蕉", "葡萄"};
        //默认被选中的布尔数组
        final boolean[] selected = {true, false, false};
        builder.setMultiChoiceItems(items, selected, new DialogInterface.OnMultiChoiceClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                selected[which] = isChecked;
            }
        });
        builder.setPositiveButton("提交", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                final StringBuffer sb = new StringBuffer();
                for (int i = 0; i < selected.length; i++) {
                    if (selected[i]) {
                        String item = items[i];
                        sb.append(item);
                    }
                }
                Toast.makeText(MainActivity.this, "选择了" + sb.toString(), Toast.LENGTH_SHORT).show();
            }
 
        });
        builder.show();
    }

4.进度对话框

/**
     * 进度对话框
     * @param v
     */
    public void onClick4(View v)
    {
        final ProgressDialog pb = new ProgressDialog(MainActivity.this);
        pb.setTitle("进度");
        pb.setMessage("正在提交数据");
        pb.show();
        //创建模拟线程
        new Thread(){
            @Override
            public void run() {
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                pb.dismiss();
            }
        }.start();
    }

5.进度条对话框

  /**
     * 进度条对话框
     *
     * @param v
     */
    public void onClick5(View v) {
        final ProgressDialog pb = new ProgressDialog(MainActivity.this);
        //设置为进度条,水平进度条
        pb.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
        pb.setTitle("进度条");
        pb.setMessage("进度条对话框内容");
        //设置进度条最大值
        pb.setMax(100);
        pb.show();
        new Thread() {
            @Override
            public void run() {
                for (int i = 0; i <= 100; i++) {
                    try {
                        Thread.sleep(300);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    pb.setProgress(i);
 
                }
                pb.dismiss();
            }
        }.start();
    }

还有自定义对话框，就是自定义一个布局，指定view，原理是一样的，这里就不在赘述了。