Android 问题整理 六
// 控值小数点后两位小数，金额输入限制
EditText.addTextChangedListener(new MoneyTextWatcher(EditText));import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
/**
* 控值小数点后两位小数
*/
public class MoneyTextWatcher implements TextWatcher {
private EditText editText;
private int digits = 2;
public MoneyTextWatcher(EditText et) {
editText = et;
}
public MoneyTextWatcher setDigits(int d) {
digits = d;
return this;
}
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
//删除“.”后面超过2位后的数据
if (s.toString().contains(".")) {
if (s.length() - 1 - s.toString().indexOf(".") > digits) {
s = s.toString().subSequence(0, s.toString().indexOf(".") + digits+1);
editText.setText(s);
editText.setSelection(s.length()); //光标移到最后
}
}
//如果"."在起始位置,则起始位置自动补0
if (s.toString().trim().substring(0).equals(".")) {
s = "0" + s;
editText.setText(s);
editText.setSelection(2);
}
//如果起始位置为0,且第二位跟的不是".",则无法后续输入
if (s.toString().startsWith("0")
&& s.toString().trim().length() > 1) {
if (!s.toString().substring(1, 2).equals(".")) {
editText.setText(s.subSequence(0, 1));
editText.setSelection(1);
return;
}
}
}
@Override
public void afterTextChanged(Editable s) {
}
}
// android 录制mp3
参考：Android 录制mp3使用mp3lame 库_chezi008-CSDN博客
github：https://github.com/chezi008/AndroidMp3Recorder
项目根：gradle
jcenter()
maven { url 'https://jitpack.io' }
app module
implementation 'com.github.chezi008:AndroidMp3Recorder:v1.0.4'<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:gravity="center"
android:layout_height="match_parent" >
<Button
android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="开始"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button_stop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="停止"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</LinearLayout>package com.zowneo.myapplication4;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import com.ibbhub.mp3recorderlib.IAudioRecorder;
import com.ibbhub.mp3recorderlib.Mp3Recorder;
import com.ibbhub.mp3recorderlib.RecorderView;
import com.ibbhub.mp3recorderlib.SpectrumView;
import java.io.File;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
Button button;
Button button_stop;
private IAudioRecorder mRecorder;
private String filePath= Environment.getExternalStorageDirectory().getPath() + "/test.mp3";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createFile();
mRecorder = new Mp3Recorder();
button = findViewById(R.id.button);
button_stop = findViewById(R.id.button_stop);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRecorder.start(filePath);
}
});
button_stop.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
mRecorder.stop();
String strFinish = String.format("录制完成，保存在：%s",filePath);
Log.e("==================", strFinish);
}
});
}
private void createFile() {
File file = new File(filePath);
if (!file.exists()){
try {
file.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
// 上传图片抓包无效，OnError 报错
com.lzy.okgo.exception.HttpException: network error! http response code is 404 or 5xx!
有可能是图片格式的问题。
附：Android 图片选择器PictureSelector 参数属性
附：【Android】简单实现拷贝文件和文件夹到另一个目录下
/**
* 转换图片格式为jpeg
* @param pngFilePath
* @param jpgFilePath
*/
public static void convertToJpg(String pngFilePath, String jpgFilePath) {
Bitmap bitmap = BitmapFactory.decodeFile(pngFilePath);
try (BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(jpgFilePath))) {
if (bitmap.compress(Bitmap.CompressFormat.JPEG, 80, bos)) {
bos.flush();
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取转换图片格式为jpeg后的路径
* @param path
* @return
*/
public static String getConvertToJpg(String path) {
File file = new File(path);
File parentFile = file.getParentFile();
String name = file.getName();
name = name.replace(".png", ".jpeg");
convertToJpg(path, parentFile+name);
return parentFile+name;
}范例：
String path = listPicBanner.get(i).getCompressPath();
filesBanner.add(new File(getConvertToJpg(path)));// 金额计算 BigDecimal加减乘除，以及保留精度
参考：BigDecimal加减乘除_csdn565973850的博客-CSDN博客
参考：java.math.BigDecimal保留两位小数_p393975269的博客-CSDN博客
BigDecimal bignum1 = new BigDecimal("10");
BigDecimal bignum2 = new BigDecimal("5");
BigDecimal bignum3 = null;
//加法
bignum3 = bignum1.add(bignum2);
System.out.println("和 是：" + bignum3);
//减法
bignum3 = bignum1.subtract(bignum2);
System.out.println("差 是：" + bignum3);
//乘法
bignum3 = bignum1.multiply(bignum2);
System.out.println("积 是：" + bignum3);
//除法
bignum3 = bignum1.divide(bignum2);
System.out.println("商 是：" + bignum3);
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