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

 <TextView
 android:id="@+id/tv_title"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginTop="20dp"
 android:gravity="center"
 android:textColor="#0474dc"
 android:textSize="22sp"
 android:textStyle="bold" />

 <TextView
 android:id="@+id/tv_description"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginTop="15dp"
 android:gravity="center"
 android:textColor="#0474dc"
 android:textSize="18sp" />

 <ImageView
 android:layout_width="70dp"
 android:layout_height="70dp"
 android:layout_gravity="center"
 android:layout_marginBottom="20dp"
 android:layout_marginTop="20dp"
 android:src="@drawable/upgrade" />

 <Button
 android:id="@+id/btn_upgrade"
 style="@style/blueButtonStyle"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:layout_marginBottom="20dp"
 android:layout_marginEnd="20dp"
 android:layout_marginStart="20dp"
 android:gravity="center"
 android:text="立即更新" />

</LinearLayout>

 <!--用于按钮的蓝色背景风格-->
 <style name="blueButtonStyle" parent="Widget.AppCompat.Button.Borderless">
 <item name="android:background">@drawable/button_blue_background</item>
 <item name="android:textAppearance">@style/blueButtonTextStyle</item>
 </style>
 <!--用于蓝色风格按钮的文本风格-->
 <style name="blueButtonTextStyle">
 <item name="android:textColor">@android:color/white</item>
 <item name="android:textSize">17sp</item>
 </style>

/**
 * 作者： 叶应是叶
 * 时间： 2017/3/23 12:36
 * 描述：
 */
public class VersionDialogFragment extends DialogFragment {

 private static final String TITLE = "title";

 private static final String DESCRIPTION = "description";

 private View.OnClickListener positiveCallback;

 private String title;

 private String description;

 public static VersionDialogFragment getInstance(String title, String description) {
  Bundle bundle = new Bundle();
  bundle.putString(TITLE, title);
  bundle.putString(DESCRIPTION, description);
  VersionDialogFragment versionDialogFragment = new VersionDialogFragment();
  versionDialogFragment.setArguments(bundle);
  return versionDialogFragment;
 }

 @Override
 public void onCreate(@Nullable Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  Bundle bundle = getArguments();
  title = bundle.getString(TITLE);
  description = bundle.getString(DESCRIPTION);
 }

 public void show(FragmentManager fragmentManager, View.OnClickListener positiveCallback) {
  this.positiveCallback = positiveCallback;
  show(fragmentManager, "VersionDialogFragment");
 }

 @NonNull
 @Override
 public Dialog onCreateDialog(Bundle savedInstanceState) {
  AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
  LayoutInflater inflater = getActivity().getLayoutInflater();
  final View view = inflater.inflate(R.layout.version_dialog, null);
  TextView tv_title = (TextView) view.findViewById(R.id.tv_title);
  TextView tv_description = (TextView) view.findViewById(R.id.tv_description);
  Button btn_upgrade = (Button) view.findViewById(R.id.btn_upgrade);
  tv_title.setText(title);
  tv_description.setText(description);
  btn_upgrade.setOnClickListener(positiveCallback);
  builder.setView(view);
  return builder.create();
 }

}

public void showDialog(View view) {
  final VersionDialogFragment dialogFragment = VersionDialogFragment.getInstance("2.0.1新版本发布啦", "更多功能等你体验");
  dialogFragment.show(getSupportFragmentManager(), new View.OnClickListener() {
   @Override
   public void onClick(View v) {
    Toast.makeText(MainActivity.this, "进行更新操作吧", Toast.LENGTH_SHORT).show();
    dialogFragment.dismiss();
   }
  });
 }

 @Override
 public void onStart() {
  super.onStart();
  Dialog dialog = getDialog();
  if (dialog != null) {
   DisplayMetrics dm = new DisplayMetrics();
   getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
   if (dialog.getWindow() != null) {
    dialog.getWindow().setLayout((int) (dm.widthPixels * 0.7), ViewGroup.LayoutParams.WRAP_CONTENT);
   }
  }
 }

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <corners android:radius="20dp" />
 <solid android:color="#ffffff" />
</shape>

 @Override
 public void onStart() {
  super.onStart();
  Dialog dialog = getDialog();
  if (dialog != null) {
   DisplayMetrics dm = new DisplayMetrics();
   getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
   if (dialog.getWindow() != null) {
    dialog.getWindow().setLayout((int) (dm.widthPixels * 0.8), ViewGroup.LayoutParams.WRAP_CONTENT);
   }
  }
 }

 @Override
 public void onStart() {
  super.onStart();
  Dialog dialog = getDialog();
  if (dialog != null) {
   DisplayMetrics dm = new DisplayMetrics();
   getActivity().getWindowManager().getDefaultDisplay().getMetrics(dm);
   if (dialog.getWindow() != null) {
    dialog.getWindow().setLayout((int) (dm.widthPixels * 0.7), ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
   }
  }
 }