本文介绍了一种在不依赖Activity的情况下启动对话框的方法。通过使用`Builder`创建对话框并设置标题、消息及按钮等属性，然后通过`WindowManager.LayoutParams.TYPE_SYSTEM_ALERT`设置对话框类型，最终显示对话框。此外，还需要在AndroidManifest.xml中添加`SYSTEM_ALERT_WINDOW`权限。
在服务启动对话框不依赖Activity
Builder builder=new Builder(getApplicationContext());
builder.setTitle("Title");
builder.setMessage("This is message");
builder.setNegativeButton("OK", null);
Dialog dialog=builder.create();
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
dialog.show();
权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
builder.setTitle("Title");
builder.setMessage("This is message");
builder.setNegativeButton("OK", null);
Dialog dialog=builder.create();
dialog.getWindow().setType(WindowManager.LayoutParams.TYPE_SYSTEM_ALERT);
dialog.show();
权限
<uses-permission android:name="android.permission.SYSTEM_ALERT_WINDOW"/>
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