Android dialog使用案例

需求：应用锁，

//自定义dialog的显示view
View view = getLayoutInflater().inflate(R.layout.passwd_dialog_view, null);
final EditText editText = (EditText) view.findViewById(R.id.dialog_edit);
AlertDialog dialog = new AlertDialog.Builder(this)
        //.setIcon(R.mipmap.ic_launcher)//设置标题的图片
        .setTitle("请输入密码")//设置对话框的标题
        .setView(view)
        .setNegativeButton("取消", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                finish();
            }
        })
        .setPositiveButton("确定", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                final String passwd = "";
                String content = editText.getText().toString().trim();
                if(content.equals(passwd)){
                    dialog.dismiss();
                }else{
                    finish();
                    Toast.makeText(getApplicationContext(),"密码错误!",Toast.LENGTH_SHORT).show();
                }
            }
        })
        //关闭其他区域点击关闭dialog
        .setCancelable(false)
        .create();
dialog.show();
//处理Android的返回键事件
dialog.setOnKeyListener(new DialogInterface.OnKeyListener() {
    @Override
    public boolean onKey(DialogInterface dialogInterface, int keyCode, KeyEvent keyEvent) {
        if (keyCode == KeyEvent.KEYCODE_BACK)
        {
            return true;
        }
        else
        {
            return false; //默认返回 false，这里false不能屏蔽返回键，改为true就能够了
        }
    }
});

 

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <EditText
        android:id="@+id/dialog_edit"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30sp"
        ></EditText>

</LinearLayout>

拓展：将dialog设置为系统级别弹窗
　　

alertdialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);

manifest配置权限

    <uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>