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最近遇到一个项目，客户要求4G的ddr固件不能刷机到3G的ddr大货主板上来，怕这样出货之后引起投诉。因为本身客户有多个项目在进行，有4G的固件和3G的固件，要求不能进行互刷，至少要进系统后有提示刷错固件。我采用的方法是系统进到桌面Launcher后去获取ddr的容量，判断不对就弹一个不可点击不可消失的弹框，客户也满意接受，具体的代码实现如下：

diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 4e566abddc..cfc23335dc 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -285,6 +285,8 @@ import java.util.function.Predicate;import java.util.function.Supplier;import java.util.stream.Stream;+import android.app.ActivityManager;
+import android.app.AlertDialog;/*** Default launcher application.*/
@@ -595,6 +597,19 @@ public class Launcher extends StatefulActivity<LauncherState>RuleController.getInstance(this).setRules(RuleController.parseRules(this, R.xml.split_configuration));}
+
+        ActivityManager activityManager = (ActivityManager) getSystemService(this.ACTIVITY_SERVICE);
+        long totalMemory = activityManager.getTotalRam();
+        //Log.d("wzh","Laucher_totalMemory = " + totalMemory);
+        if(totalMemory < 2786946304L || totalMemory > 3586946304L) {
+           AlertDialog.Builder builder = new AlertDialog.Builder(this);
+           builder.setTitle("软件错误")
+           .setMessage("内存不对")
+           .setCancelable(false);
+
+           AlertDialog dialog = builder.create();
+           dialog.show();
+        }}protected ModelCallbacks createModelCallbacks() {