应用字体大小的设置

1.在application中进行注册

public class MyApplication extends Application {

public static int info=1;//默认的字体的状态

public static Context context;

public static Context getContext(){

return context;

}

2.设置字体单位转变的的方法

public class WenUtils {

/**

* 根据手机的分辨率dp的单位转为px(像素)

* @param px

* @return

*/

public static int px2dip(int px) {

//获取像素密度

float density = MyApplication.getContext().getResources().getDisplayMetrics().density;、

int dip = (int) (px / density + 0.5f);

return dip;

}

}

3.设置点击事件，通过单选框进行给字的状态赋值

sliding__radio_sz.setOnClickListener(new View.OnClickListener() {

@Override

public void onClick(View v) {

//设置字体的大小

String str[] =new String[]{"小","中","大"};

AlertDialog.Builder builder = new AlertDialog.Builder(NewsActivity.this);

builder.setTitle("请选择设置的字体的大小");

builder.setIcon(R.mipmap.icon);

builder.setSingleChoiceItems(str, -1, new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

switch (which){

case 0:

//记录状态

MyApplication.info=0;

dialog.dismiss();

break;

case 1:

MyApplication.info=1;

dialog.dismiss();

break;

case 2:

MyApplication.info=2;

dialog.dismiss();

break;

}

}

});

builder.create().show();

}

});

4.在适配器中进行判断状态（info）是几，给字体赋大小

if(MyApplication.info==0){

//调用设置字体大小的方法

holder1.title1.setTextSize(WenUtils.px2dip(15));

}else if(MyApplication.info==1){

holder1.title1.setTextSize(WenUtils.px2dip(20));

}else{

holder1.title1.setTextSize(WenUtils.px2dip(30));

}