android初级小技巧

时间戳转换日期格式字符串

String format = "yyyy-MM-dd HH:mm:ss";

SimpleDateFormat dateFormat = new SimpleDateFormat(format);

String format1 = dateFormat.format(time);

//EditText中密码的显示和隐藏

if (basd==true){
    editLoginPassword.setTransformationMethod(HideReturnsTransformationMethod.getInstance());//显示
}else {
    editLoginPassword.setTransformationMethod(PasswordTransformationMethod.getInstance());//隐藏
}
editLoginPassword.setSelection(editLoginPassword.getText().length());//光标位置

 

RecyclerView禁止滑动

PersonalMeetingLecturerAdapter adapter = new PersonalMeetingLecturerAdapter(this);

rvMeetingCurrent.setLayoutManager(new LinearLayoutManager(this));

rvMeetingCurrent.setNestedScrollingEnabled(false);//禁止滑动

rvMeetingCurrent.setAdapter(adapter);

//Xrecyclerview依赖(配合recyclerview使用,所以....)

implementation('com.jcodecraeer:xrecyclerview:1.5.9') {

exclude group: 'com.android.support'

}

implementation 'com.android.support:recyclerview-v7:27.1.1'

 

Fresco缓存SD卡

 

DiskCacheConfig butter = DiskCacheConfig.newBuilder(this)
                .setBaseDirectoryName("imager")
                .setBaseDirectoryPath(Environment.getExternalStorageDirectory())
                .build();

        ImagePipelineConfig config = ImagePipelineConfig.newBuilder(this)
                .setMainDiskCacheConfig(butter)
                .build();

        Fresco.initialize(this,config);

butterknife的版本8.5.1的就行

因为编译了两次加

 

android {

...

defaultConfig {

...

javaCompileOptions {

annotationProcessorOptions {

includeCompileClasspath = true

}

}

}

}

SharedPreferences 的使用

SharedPreferences preferences = getSharedPreferences("boxt", MODE_PRIVATE);

SharedPreferences.Editor editor = preferences.edit();

//使用

boolean box = preferences.getBoolean("box",false);

String name = preferences.getString("name", "");

String prass = preferences.getString("prass", "");

 

//存值

editor.putBoolean("box",true);

edit.putString("phone",name);

edit.putString("pwd",prass);

editor.commit();

 

获取[{"commodityId":23,"count":1}]数据

JSONArray jsonArray=new JSONArray();

JSONObject jsonObject=null;

try {

jsonObject=new JSONObject();

jsonObject.put("commodityId",commodityId);

jsonObject.put("count",1);

} catch (JSONException e) {

e.printStackTrace();

}

jsonArray.put(jsonObject);

Log.e("-----",jsonArray.toString());