Android全域性改變字型大小(坑)
這邊分享一個功能需求,全域性改變字型大小。當下的情景比較蛋疼…一個祖傳的專案,需要在半路新增這個需求,各種字型大小已經寫明在xml裡面了,dp,sp,甚至xp不等。當時內心是拒絕的,但是由於使用者反饋實在要做,而且app面向的使用者為老年使用者居多,還是決定踩坑了。這裡也善意提醒大家,凡事留一線,日後好給自己留活路。所以,我進入了漫長的百度或者是google…
一. 正確的姿勢(我認為)
參考https://blog.csdn.net/mrwangxsyz/article/details/48767555
首先想到的就是通過style設定字型的自定義屬性,重啟當前應用,通過BaseActivity修改屬性識別符號去控制當前字型的大小,當前頁面需要手動設定,貌似都需要,然後要重啟之前的頁面。奈何我這個專案已經過半,在xml中基本是寫死的,比較絕望當時,原本想硬著頭皮繼續下去的….
參考思路連結:
二. 勉強將就的姿勢(成功瞞過產品經理,並且比ios還改的快)
看到網上有一種方式就是字型設定一般是sp,一開始區分dp的時候就隱約記得有一個縮放係數,那麼我們不妨從這裡入手,檢視下原始碼發現是這個scaledDesity
那麼我們只需要改變這個引數的大小就可以了,頓時看到了希望
1.思路,首先需要知道的是要改變scaledDesity
//重寫字型縮放比例 api<25
@Override
public Resources getResources() {
Resources res =super.getResources ();
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.N) {
Configuration config = res.getConfiguration();
config.fontScale= MyApplication.getMyInstance().getFontScale();//1 設定正常字型大小的倍數
res.updateConfiguration(config,res.getDisplayMetrics());
}
return res;
}
這裡可以看到在25版本以後的api拋棄了這個方法
/**
* Store the newly updated configuration.
*
* @deprecated See {@link android.content.Context#createConfigurationContext(Configuration)}.
*/
@Deprecated
public void updateConfiguration(Configuration config, DisplayMetrics metrics) {
updateConfiguration(config, metrics, null);
}
那麼使用這個方法createConfigurationContext
//重寫字型縮放比例 api>25
@Override
protected void attachBaseContext(Context newBase) {
if(Build.VERSION.SDK_INT>Build.VERSION_CODES.N){
final Resources res = newBase.getResources();
final Configuration config = res.getConfiguration();
config.fontScale=MyApplication.getMyInstance().getFontScale();//1 設定正常字型大小的倍數
final Context newContext = newBase.createConfigurationContext(config);
super.attachBaseContext(newContext);
}else{
super.attachBaseContext(newBase);
}
}
2.正常情況下需要通知下發關閉前面的設定頁面,然後重啟主頁面。這裡使用EventBus或者RxBus通知會方便一些
這裡使用了RxBus
2.1.RxBus的使用
新增依賴
compile 'io.reactivex.rxjava2:rxjava:2.0.5'
compile 'io.reactivex.rxjava2:rxandroid:2.0.1'
RxBus程式碼:
package com.demo.textsizechange;
import android.support.annotation.NonNull;
import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import io.reactivex.Observable;
import io.reactivex.subjects.PublishSubject;
import io.reactivex.subjects.Subject;
/**
* Created by RJS on 2016/7/18.
*/
public class RxBus {
private ConcurrentHashMap<Object, List<Subject>> maps = new ConcurrentHashMap<>();
private static RxBus instance;
private RxBus() {
}
private static class RxBusHolder{
private static RxBus instance = new RxBus();
}
public static RxBus getInstance() {
return RxBusHolder.instance;
}
@SuppressWarnings("unchecked")
public <T> Observable<T> register(@NonNull Object tag, @NonNull Class<T> clazz) {
List<Subject> subjects = maps.get(tag);
if (subjects == null) {
subjects = new ArrayList<>();
maps.put(tag, subjects);
}
Subject<T> subject = PublishSubject.<T>create();
subjects.add(subject);
return subject;
}
@SuppressWarnings("unchecked")
public void unregister(@NonNull Object tag, @NonNull Observable observable) {
List<Subject> subjects = maps.get(tag);
if (subjects != null) {
subjects.remove((Subject) observable);
if (subjects.isEmpty()) {
maps.remove(tag);
}
}
}
@SuppressWarnings("unchecked")
public void post(@NonNull Object o) {
post(o.getClass().getSimpleName(), o);
}
@SuppressWarnings("unchecked")
public void post(@NonNull Object tag, @NonNull Object o) {
List<Subject> subjects = maps.get(tag);
if (subjects != null && !subjects.isEmpty()) {
for (Subject s : subjects) {
s.onNext(o);
}
}
}
/**
private Observable<String> observable;
observable = RxBus.getInstance().register(getClassName(), String.class);
observable.observeOn(AndroidSchedulers.mainThread()).subscribe(new Action1<String>() {
@Override
public void call(String s) {
Log.e("zhang", "receiver "+s);
}
});
RxBus.getInstance().unregister("zhang", zhang);
RxBus.getInstance().post("zhang", "傳遞資料++++++");
*/
}
3.需要重啟頁面
// this.recreate();
Intent intent = getIntent();
overridePendingTransition(0, 0);
intent.addFlags(Intent.FLAG_ACTIVITY_NO_ANIMATION);
finish();
overridePendingTransition(0, 0);
startActivity(intent);
5.ok基本上比較清晰了,上程式碼
BaseActivity.java
package com.demo.textsizechange;
import android.content.Context;
import android.content.Intent;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import io.reactivex.Observable;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.functions.Consumer;
/**
* Created by zsj on 2016/8/4.
*/
public abstract class BaseActivity extends AppCompatActivity {
public Observable observable;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
observable = RxBus.getInstance().register(this.getClass().getSimpleName(), MessageSocket.class);
observable.observeOn(AndroidSchedulers.mainThread()).subscribe(new Consumer<MessageSocket>() {
@Override
public void accept(MessageSocket message) throws Exception {
rxBusCall(message);
}
});
}
public void rxBusCall(MessageSocket message) {
}
public int getColorById(int resId) {
return ContextCompat.getColor(this, resId);
}
public void goActivity(Class<?> activity) {
Intent intent = new Intent();
intent.setClass(getApplicationContext(), activity);
startActivity(intent);
}
@Override
protected void onDestroy() {
super.onDestroy();
RxBus.getInstance().unregister(this.getClass().getSimpleName(), observable);
}
//重寫字型縮放比例 api<25
@Override
public Resources getResources() {
Resources res =super.getResources();
if (Build.VERSION.SDK_INT <= Build.VERSION_CODES.N) {
Configuration config = res.getConfiguration();
config.fontScale= MyApplication.getMyInstance().getFontScale();//1 設定正常字型大小的倍數
res.updateConfiguration(config,res.getDisplayMetrics());
}
return res;
}
//重寫字型縮放比例 api>25
@Override
protected void attachBaseContext(Context newBase) {
if(Build.VERSION.SDK_INT>Build.VERSION_CODES.N){
final Resources res = newBase.getResources();
final Configuration config = res.getConfiguration();
config.fontScale=MyApplication.getMyInstance().getFontScale();//1 設定正常字型大小的倍數
final Context newContext = newBase.createConfigurationContext(config);
super.attachBaseContext(newContext);
}else{
super.attachBaseContext(newBase);
}
}
}
使用TextSizeShowActivity
package com.demo.textsizechange;
import android.graphics.Color;
import android.os.Bundle;
import android.os.Handler;
import android.view.KeyEvent;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;
import butterknife.BindView;
import butterknife.ButterKnife;
import fontsliderbar.FontSliderBar;
/**
* Created by zsj on 2017/9/11.
* 字型設定展示
*/
public class TextSizeShowActivity extends BaseActivity {
@BindView(R.id.fontSliderBar)
FontSliderBar fontSliderBar;
@BindView(R.id.tv_chatcontent1)
TextView tvContent1;
@BindView(R.id.tv_chatcontent)
TextView tvContent2;
@BindView(R.id.tv_chatcontent3)
TextView tvContent3;
@BindView(R.id.iv_back)
ImageView ivBack;
@BindView(R.id.iv_userhead)
ImageView ivUserhead;
private float textsize1, textsize2, textsize3;
private float textSizef;//縮放比例
private int currentIndex;
private boolean isClickable = true;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_textsizeshow);
ButterKnife.bind(this);
initData();
}
private void initData() {
currentIndex = MyApplication.getMyInstance().getPreferencesHelper().getValueInt("currentIndex", 1);
textSizef = 1 + currentIndex * 0.1f;
textsize1 = tvContent1.getTextSize() / textSizef;
textsize2 = tvContent2.getTextSize() / textSizef;
textsize3 = tvContent3.getTextSize() / textSizef;
fontSliderBar.setTickCount(6).setTickHeight(DisplayUtils.convertDip2Px(TextSizeShowActivity.this, 15)).setBarColor(Color.GRAY)
.setTextColor(Color.BLACK).setTextPadding(DisplayUtils.convertDip2Px(TextSizeShowActivity.this, 10)).setTextSize(DisplayUtils.convertDip2Px(TextSizeShowActivity.this, 14))
.setThumbRadius(DisplayUtils.convertDip2Px(TextSizeShowActivity.this, 10)).setThumbColorNormal(Color.GRAY).setThumbColorPressed(Color.GRAY)
.setOnSliderBarChangeListener(new FontSliderBar.OnSliderBarChangeListener() {
@Override
public void onIndexChanged(FontSliderBar rangeBar, int index) {
if(index>5){
return;
}
index = index - 1;
float textSizef = 1 + index * 0.1f;
setTextSize(textSizef);
}
}).setThumbIndex(currentIndex).withAnimation(false).applay();
ivBack.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (fontSliderBar.getCurrentIndex() != currentIndex) {
if (isClickable) {
isClickable = false;
refresh();
}
} else {
finish();
}
}
});
}
private void setTextSize(float textSize) {
//改變當前頁面的字型大小
tvContent1.setTextSize(DisplayUtils.px2sp(TextSizeShowActivity.this, textsize1 * textSize));
tvContent2.setTextSize(DisplayUtils.px2sp(TextSizeShowActivity.this, textsize2 * textSize));
tvContent3.setTextSize(DisplayUtils.px2sp(TextSizeShowActivity.this, textsize3 * textSize));
}
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
if (currentIndex != fontSliderBar.getCurrentIndex()) {
if (isClickable) {
isClickable = false;
refresh();
}
} else {
finish();
}
return true;
}
return super.onKeyDown(keyCode, event);
}
private void refresh() {
//儲存標尺的下標
MyApplication.getMyInstance().getPreferencesHelper().setValue("currentIndex", fontSliderBar.getCurrentIndex());
//通知主頁面重啟
RxBus.getInstance().post(MainActivity.class.getSimpleName(), new MessageSocket(99, null, null, null));
//重啟mainActivity
RxBus.getInstance().post(MainActivity.class.getSimpleName(), new MessageSocket(99, null, null, null));
// showMyDialog();
//2s後關閉 延遲執行任務 重啟完主頁
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
// hideMyDialog();
finish();
}
}, 2000);
}
}
三.總結
不將就一個個修改,那麼久沉下心來分析,然後總結下,避免下次繼續踩坑。