一篇关于meta-data的转载记录

application下

<application ... >
    <meta-data android:name="TEST_KEY" android:value="${test_key}"/>
</application>

        try {
            ApplicationInfo info = getPackageManager().getApplicationInfo(getPackageName(), PackageManager.GET_META_DATA);
            Log.e("info", info.metaData.getString("TEST_KEY"));
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

activity下

<activity ... >
    <meta-data android:name="TEST_KEY" android:value="${test_key}"/>
</activity>

        try {
            ActivityInfo info = getPackageManager().getActivityInfo(getComponentName(), PackageManager.GET_META_DATA);
            Log.e("info", info.metaData.getString("TEST_KEY"));
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

service下

<service ... >
    <meta-data android:name="TEST_KEY" android:value="${test_key}"/>
</service>

        try {
            ServiceInfo info = getPackageManager().getServiceInfo(getComponentName(), PackageManager.GET_META_DATA);
            Log.e("info", info.metaData.getString("TEST_KEY"));
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

receiver下

<receiver ... >
    <meta-data android:name="TEST_KEY" android:value="${test_key}"/>
</receiver>

        try {
            ActivityInfo info = getPackageManager().getReceiverInfo(getComponentName(), PackageManager.GET_META_DATA);
            Log.e("info", info.metaData.getString("TEST_KEY"));
        } catch (PackageManager.NameNotFoundException e) {
            e.printStackTrace();
        }

manifestPlaceholders使用

在build.gradle的多版本中设置

            manifestPlaceholders = ["test_key": "修改的内容"]

好比如下

    productFlavors{
        dev{
            manifestPlaceholders = ["test_key": "测试版key"]
        }
        free{
            applicationIdSuffix ".free"
            manifestPlaceholders = ["test_key": "Free版key"]
        }
    }

效果如下