修改设置数据流量警告默认为关闭状态

客户有需求，需要设置中的设置数据流量警告默认为关闭状态。

 代码跟踪流程：

　Settings中搜索“设置数据流量警告”，strings.xml内容如下：

 再找set_data_warning对应的布局文件billing_cycle.xml

 billing_cycle.xml对应的java文件为BillingCycleSettings.java

    @VisibleForTesting
    void updatePrefs() {
        mBillingCycle.setSummary(null);
        final long warningBytes = services.mPolicyEditor.getPolicyWarningBytes(mNetworkTemplate);
        if (warningBytes != WARNING_DISABLED) {
            mDataWarning.setSummary(DataUsageUtils.formatDataUsage(getContext(), warningBytes));
            mDataWarning.setEnabled(true);
            mEnableDataWarning.setChecked(true);
        } else {
            mDataWarning.setSummary(null);
            mDataWarning.setEnabled(false);
            mEnableDataWarning.setChecked(false);
        }
        final long limitBytes = services.mPolicyEditor.getPolicyLimitBytes(mNetworkTemplate);
        if (limitBytes != LIMIT_DISABLED) {
            mDataLimit.setSummary(DataUsageUtils.formatDataUsage(getContext(), limitBytes));
            mDataLimit.setEnabled(true);
            mEnableDataLimit.setChecked(true);
        } else {
            mDataLimit.setSummary(null);
            mDataLimit.setEnabled(false);
            mEnableDataLimit.setChecked(false);
        }
    }

根据services.mPolicyEditor.getPolicyWarningBytes(mNetworkTemplate)获取的默认值，决定是打开还是关闭。

getPolicyWarningBytes在frameworks\base\packages\SettingsLib\src\com\android\settingslib\NetworkPolicyEditor.java中定义：

public long getPolicyWarningBytes(NetworkTemplate template) {
        final NetworkPolicy policy = getPolicy(template);
        return (policy != null) ? policy.warningBytes : WARNING_DISABLED;
    }

 public NetworkPolicy getPolicy(NetworkTemplate template) {
        for (NetworkPolicy policy : mPolicies) {
            if (policy.template.equals(template)) {
                return policy;
            }
        }
        return null;
    }

 

policy在NetworkPolicyManagerService.java中赋值：

frameworks\base\services\core\java\com\android\server\net\NetworkPolicyManagerService.java

 ensureActiveMobilePolicyAL

　　--> buildDefaultMobilePolicy

　　　　--> buildDefaultMobilePolicy

  private boolean ensureActiveMobilePolicyAL(int subId, String subscriberId) {
        。。。。
        final NetworkPolicy policy = buildDefaultMobilePolicy(subId, subscriberId);
        addNetworkPolicyAL(policy);
        return true;
    }

 @VisibleForTesting
    NetworkPolicy buildDefaultMobilePolicy(int subId, String subscriberId) {
        final NetworkTemplate template = buildTemplateMobileAll(subscriberId);
        final RecurrenceRule cycleRule = NetworkPolicy
                .buildRule(ZonedDateTime.now().getDayOfMonth(), ZoneId.systemDefault());
        final NetworkPolicy policy = new NetworkPolicy(template, cycleRule,
                getPlatformDefaultWarningBytes(), getPlatformDefaultLimitBytes(),
                SNOOZE_NEVER, SNOOZE_NEVER, true, true);
        synchronized (mUidRulesFirstLock) {
            synchronized (mNetworkPoliciesSecondLock) {
                updateDefaultMobilePolicyAL(subId, policy);
            }
        }
        return policy;
    }

    private long getPlatformDefaultWarningBytes() {
        final int dataWarningConfig = mContext.getResources().getInteger(
                com.android.internal.R.integer.config_networkPolicyDefaultWarning);
        // if (dataWarningConfig == WARNING_DISABLED) {
        //     return WARNING_DISABLED;
        // } else {
        //     return dataWarningConfig * MB_IN_BYTES;
        // }
        return WARNING_DISABLED;
    }

这个地方不做判断，直接return WARNING_DISABLED，即是默认关闭。

R.integer.config_networkPolicyDefaultWarning的值作为流量警告字节，定义如下：

 也就是默认的2G，若需要修改更大的值，修改这个值即可。

参考：https://blog.51cto.com/u_16099256/8228905