Android通过代码实现多语言切换createConfigurationContextattachBaseContextgetResourcesupdateConfiguration
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updateConfiguration 过时兼容处理
@Override
public Resources getResources() //此方法会 多次 调用
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 900;
//updateConfiguration 过时兼容处理
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1)
return createConfigurationContext(configuration).getResources();
else
Resources resources = super.getResources();
resources.updateConfiguration(configuration, resources.getDisplayMetrics());
return resources;
自定义view时获取指定带configuration的context
private Context getSplitScreenContext()
Configuration newConfig = new Configuration();
newConfig.setToDefaults();
newConfig.smallestScreenWidthDp = MyApplication.mSmallestScreenWidthDp;
Context context = mContext.createConfigurationContext(newConfig);
return new ContextWrapper(context);
//
LayoutInflater.from(getSplitScreenContext())
参考
测试demo 1: 重写 attachBaseContext
public class MyApplication extends Application
private static final String TAG = MyApplication.class.getSimpleName();
@Override
public void onCreate()
super.onCreate();
int smallestScreenWidthDp1 = getApplicationContext().getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application onCreate: 1=========" + smallestScreenWidthDp1);//600
int smallestScreenWidthDp2 = getBaseContext().getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application onCreate: 2=========" + smallestScreenWidthDp2);//600
@Override
protected void attachBaseContext(Context newBase)
int smallestScreenWidthDp = newBase.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application attachBaseContext: 1=========" + smallestScreenWidthDp);//720
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 600;
super.attachBaseContext(newBase.createConfigurationContext(configuration));
Log.e(TAG, "Application attachBaseContext: 2=========" + smallestScreenWidthDp);//720
public class MainActivity8 extends AppCompatActivity
private static final String TAG = MainActivity8.class.getSimpleName();
@SuppressLint("ClickableViewAccessibility")
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main8);
Context baseContext = getBaseContext();
Context applicationContext = getApplicationContext();
Log.e(TAG, "this: ========" + this);//【803afaa】
Log.e(TAG, "getBaseContext(): ========" + baseContext);//【93c79b】
//getApplication 和 getApplicationContext 一样地址
Log.e(TAG, "getApplication(): ========" + getApplication()); //【@29f6738】
Log.e(TAG, "getApplicationContext(): ========" + applicationContext);//【29f6738】
// getResources() 和 getBaseContext().getResources() 在 activity 中同一个对象【ca23311】
// getApplicationContext().getResources() 为另一个对象 【cc51c76】
Log.e(TAG, "getResources(): 1=======" + getResources());//【ca23311】
Log.e(TAG, "getResources(): 2========" + baseContext.getResources());//【ca23311】
Log.e(TAG, "getResources(): 3========" + applicationContext.getResources());//【cc51c76】
//activity 中 attachBaseContext 仅仅会影响以下2个:
int smallestScreenWidthDp1 = getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "smallestScreenWidthDp: 1========" + smallestScreenWidthDp1);//900
int smallestScreenWidthDp2 = baseContext.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "smallestScreenWidthDp: 2========" + smallestScreenWidthDp2);//900
//application 中 attachBaseContext 仅仅会影响以下:
int smallestScreenWidthDp3 = applicationContext.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "smallestScreenWidthDp: 3========" + smallestScreenWidthDp3);//600
@Override
protected void attachBaseContext(Context newBase)
int smallestScreenWidthDp = newBase.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "activity attachBaseContext: 1=========" + smallestScreenWidthDp);//720
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 900;
super.attachBaseContext(newBase.createConfigurationContext(configuration));
Log.e(TAG, "activity attachBaseContext: 2=========" + smallestScreenWidthDp);//720
日志打印:
MyApplication: Application attachBaseContext: 1=========720
MyApplication: Application attachBaseContext: 2=========720
MyApplication: Application onCreate: 1=========600
MyApplication: Application onCreate: 2=========600
MainActivity8: activity attachBaseContext: 1=========720
MainActivity8: activity attachBaseContext: 2=========720
MainActivity8: this: ========com.xq.myapplication.MainActivity8@6070295
MainActivity8: getBaseContext(): ========androidx.appcompat.view.ContextThemeWrapper@22f444e
MainActivity8: getApplication(): ========com.xq.myapplication.MyApplication@744096f
MainActivity8: getApplicationContext(): ========com.xq.myapplication.MyApplication@744096f
MainActivity8: getResources(): 1=======android.content.res.Resources@db2067c
MainActivity8: getResources(): 2========android.content.res.Resources@db2067c
MainActivity8: getResources(): 3========android.content.res.Resources@2aebb05
MainActivity8: smallestScreenWidthDp: 1========900
MainActivity8: smallestScreenWidthDp: 2========900
MainActivity8: smallestScreenWidthDp: 3========600
测试demo 2: 重写 attachBaseContext 和 getResources
- 重写
attachBaseContext
和 重写getResources
都可以改变configuration
- 生命周期
attachBaseContext
->getResources
->onCreate
: 所以getResources
会覆盖attachBaseContext
public class MyApplication extends Application
private static final String TAG = MyApplication.class.getSimpleName();
@Override
public void onCreate()
super.onCreate();
int smallestScreenWidthDp1 = getApplicationContext().getResources().getConfiguration().smallestScreenWidthDp;
//getResources()会覆盖attachBaseContext()
Log.e(TAG, "Application onCreate: 1=========" + smallestScreenWidthDp1);//300
int smallestScreenWidthDp2 = getBaseContext().getResources().getConfiguration().smallestScreenWidthDp;
//getResources()会覆盖attachBaseContext()
Log.e(TAG, "Application onCreate: 2=========" + smallestScreenWidthDp2);//300
@Override
protected void attachBaseContext(Context newBase) //此方法会 1 次调用
int smallestScreenWidthDp = newBase.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application attachBaseContext: 1=========" + smallestScreenWidthDp);//720不会变
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 600;
super.attachBaseContext(newBase.createConfigurationContext(configuration));
Log.e(TAG, "Application attachBaseContext: 2=========" + smallestScreenWidthDp);//720不会变
@Override
public Resources getResources() //此方法会 多次 调用
Resources resources = super.getResources();
int smallestScreenWidthDp1 = resources.getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application getResources: 1=========" + smallestScreenWidthDp1);
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 300;
resources.updateConfiguration(configuration, resources.getDisplayMetrics());
int smallestScreenWidthDp2 = resources.getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "Application getResources: 2=========" + smallestScreenWidthDp2);
return resources;
public class MainActivity8 extends AppCompatActivity implements View.OnTouchListener
private static final String TAG = MainActivity8.class.getSimpleName();
@SuppressLint("ClickableViewAccessibility")
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main8);
Context baseContext = getBaseContext();
Context applicationContext = getApplicationContext();
Log.e(TAG, "this: ========" + this);//【803afaa】
Log.e(TAG, "getBaseContext(): ========" + baseContext);//【93c79b】
//getApplication 和 getApplicationContext 一样地址
Log.e(TAG, "getApplication(): ========" + getApplication()); //【@29f6738】
Log.e(TAG, "getApplicationContext(): ========" + applicationContext);//【29f6738】
// getResources() 和 getBaseContext().getResources() 在 activity 中同一个对象【ca23311】
// getApplicationContext().getResources() 为另一个对象 【cc51c76】
Log.e(TAG, "getResources(): 1=======" + getResources());//【ca23311】
Log.e(TAG, "getResources(): 2========" + baseContext.getResources());//【ca23311】
Log.e(TAG, "getResources(): 3========" + applicationContext.getResources());//【cc51c76】
//activity 中 attachBaseContext 仅仅会影响以下2个:
int smallestScreenWidthDp1 = getResources().getConfiguration().smallestScreenWidthDp;
//getResources()会覆盖attachBaseContext()
Log.e(TAG, "smallestScreenWidthDp: 1========" + smallestScreenWidthDp1);//900
int smallestScreenWidthDp2 = baseContext.getResources().getConfiguration().smallestScreenWidthDp;
//getResources()会覆盖attachBaseContext()
Log.e(TAG, "smallestScreenWidthDp: 2========" + smallestScreenWidthDp2);//900
//application 中 attachBaseContext 仅仅会影响以下:
int smallestScreenWidthDp3 = applicationContext.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "smallestScreenWidthDp: 3========" + smallestScreenWidthDp3);//300
@Override
protected void attachBaseContext(Context newBase) //此方法会 1 次调用
int smallestScreenWidthDp = newBase.getResources().getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "activity attachBaseContext: 1=========" + smallestScreenWidthDp);//720不会变
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 1200;
super.attachBaseContext(newBase.createConfigurationContext(configuration));
Log.e(TAG, "activity attachBaseContext: 2=========" + smallestScreenWidthDp);//720不会变
@Override
public Resources getResources() //此方法会 多次 调用
Resources resources = super.getResources();
int smallestScreenWidthDp1 = resources.getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "activity getResources: 1=========" + smallestScreenWidthDp1);
Configuration configuration = new Configuration();
configuration.smallestScreenWidthDp = 900;
resources.updateConfiguration(configuration, resources.getDisplayMetrics());
int smallestScreenWidthDp2 = resources.getConfiguration().smallestScreenWidthDp;
Log.e(TAG, "activity getResources: 2=========" + smallestScreenWidthDp2);
return resources;
打印
MyApplication: Application attachBaseContext: 1=========720
MyApplication: Application attachBaseContext: 2=========720
MyApplication: Application getResources: 1=========600
MyApplication: Application getResources: 2=========300
MyApplication: Application onCreate: 1=========300
MyApplication: Application onCreate: 2=========300
MyApplication: Application getResources: 1=========300
MyApplication: Application getResources: 2=========300
MyApplication: Application getResources: 1=========300
MyApplication: Application getResources: 2=========300
MyApplication: Application getResources: 1=========300
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