1.创建多语言包

11.gif

2.首先在onCreate方法中调用此方法查看上一次保存的是什么语言

 public void setLanguage() {
        //根据读取到存放在sp里面的数据 进行设置
        Configuration configuration = getResources().getConfiguration();

        SharedPreferences sharedPreferences = getSharedPreferences("key", MODE_PRIVATE);
        int language = sharedPreferences.getInt("language", 0);

        switch (language) {
            case 0:
                configuration.setLocale(Locale.CHINESE);
                break;
            case 1:
                configuration.setLocale(Locale.ENGLISH);
                break;
        }
        getResources().updateConfiguration(configuration, getResources().getDisplayMetrics());
    }

3.点击某个按钮弹出选择框选择语言包

   btn_qiehuan.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String[] strings = {"简体中文", "English"};
                //首次进入判断是否是中文语言
                int selected = getSharedPreferences("language", Context.MODE_PRIVATE).getInt("language", -1);
                if (selected == -1) {
                    String defaultLanguage = Locale.getDefault().toString();
                    if (defaultLanguage.equals(Locale.CHINESE.toString()) || defaultLanguage.equals(Locale.SIMPLIFIED_CHINESE.toString())
                            || defaultLanguage.equals(Locale.TRADITIONAL_CHINESE.toString())) {
                        selected = 0;
                    } else {
                        selected = 1;
                    }
                }
                new AlertDialog.Builder(MainActivity.this)
                        .setSingleChoiceItems(strings, selected,
                                new DialogInterface.OnClickListener() {
                                    //点击单选框某一项以后
                                    public void onClick(DialogInterface dialogInterface, int i) {
                                        SharedPreferences preferences = getSharedPreferences("language", Context.MODE_PRIVATE);
                                        SharedPreferences.Editor editor = preferences.edit();
                                        editor.putInt("language", i);
                                        editor.commit();
                                        dialogInterface.dismiss();
                                        //重启activity
                                        finish();
                                        Intent intent = new Intent(MainActivity.this, MainActivity.class);
                                        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
                                        startActivity(intent);
                                    }
                                })
                        .create()
                        .show();
            }
        });

效果演示~~~

8CAE7CF01EBF6D296AC192C82287105F.gif