Android中自定义dialog方法，可直接调用，更改样式

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:background="#ffffff">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:layout_margin="15px">

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="40px"
android:text="是否删除任务/卸载程序?"
/>

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center">

<Button
android:id="@+id/negativeButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="取消"
android:layout_marginRight="50px"/>

<Button
android:id="@+id/positiveButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="确定"
android:layout_marginLeft="50px"/>

</LinearLayout>

</LinearLayout>

//显示对话框
private void showNormalDia() {
LinearLayout layout = (LinearLayout)LayoutInflater.from(this).inflate(R.layout.dialog_delete, null );
//对话框
Dialog dialog = new AlertDialog.Builder(MainActivity.this).create();
dialog.show();
dialog.getWindow().setContentView(layout);

//取消按钮
Button negativeButton = (Button) layout.findViewById(R.id.negativeButton);
negativeButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "cancel", Toast.LENGTH_SHORT).show();
}
});

//确定按钮
Button positionButton = (Button) layout.findViewById(R.id.positiveButton);
positionButton.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "ok", Toast.LENGTH_SHORT).show();
}
});
}