超簡單的仿ios清除快取

首先一個快取工具類

/**

• 快取工具類
  */
  public class CacheUtil {

  /**

  • 獲取快取大小
  • @param context
  • @return
  • @throws Exception
    */
    public static String getTotalCacheSize(Context context) throws Exception {
    long cacheSize = getFolderSize(context.getCacheDir());
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    cacheSize += getFolderSize(context.getExternalCacheDir());
    }
    return getFormatSize(cacheSize);
    }

  /***

  • 清理所有快取
  • @param context
    */
    public static void clearAllCache(Context context) {
    deleteDir(context.getCacheDir());
    if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) {
    deleteDir(context.getExternalCacheDir());
    }
    }

  private static boolean deleteDir(File dir) {
  if (dir != null && dir.isDirectory()) {
  String[] children = dir.list();
  for (int i = 0; i < children.length; i++) {
  boolean success = deleteDir(new File(dir, children[i]));
  if (!success) {
  return false;
  }
  }
  }
  return dir.delete();
  }

  // 獲取檔案
  //Context.getExternalFilesDir() --> SDCard/Android/data/你的應用的包名/files/ 目錄，一般放一些長時間儲存的資料
  //Context.getExternalCacheDir() --> SDCard/Android/data/你的應用包名/cache/目錄，一般存放臨時快取資料
  public static long getFolderSize(File file) throws Exception {
  long size = 0;
  try {
  File[] fileList = file.listFiles();
  for (int i = 0; i < fileList.length; i++) {
  // 如果下面還有檔案
  if (fileList[i].isDirectory()) {
  size = size + getFolderSize(fileList[i]);
  } else {
  size = size + fileList[i].length();
  }
  }
  } catch (Exception e) {
  e.printStackTrace();
  }
  return size;
  }

  /**

  • 格式化單位

  • @param size

  • @return
    */
    public static String getFormatSize(double size) {
    double kiloByte = size / 1024;
    if (kiloByte < 1) {
    // return size + 「Byte」;
    return 「0K」;
    }

    double megaByte = kiloByte / 1024;
    if (megaByte < 1) {
    BigDecimal result1 = new BigDecimal(Double.toString(kiloByte));
    return result1.setScale(2, BigDecimal.ROUND_HALF_UP)
    .toPlainString() + 「KB」;
    }

    double gigaByte = megaByte / 1024;
    if (gigaByte < 1) {
    BigDecimal result2 = new BigDecimal(Double.toString(megaByte));
    return result2.setScale(2, BigDecimal.ROUND_HALF_UP)
    .toPlainString() + 「MB」;
    }

    double teraBytes = gigaByte / 1024;
    if (teraBytes < 1) {
    BigDecimal result3 = new BigDecimal(Double.toString(gigaByte));
    return result3.setScale(2, BigDecimal.ROUND_HALF_UP)
    .toPlainString() + 「GB」;
    }
    BigDecimal result4 = new BigDecimal(teraBytes);
    return result4.setScale(2, BigDecimal.ROUND_HALF_UP).toPlainString()
    + 「TB」;
    }
    }

//佈局 兩個字型顏色和一個右箭頭的圖片我就不貼了

<LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical">
            <TextView
                android:textSize="@dimen/sp_16"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:padding="@dimen/dp_8"
                android:text="清除快取"
                android:textColor="@color/color_tab_true" />

            <TextView
                android:drawablePadding="@dimen/dp_10"
                android:text="0kb"
                android:textSize="@dimen/sp_14"
                android:textColor="@color/color_gray1"
                android:gravity="right"
                android:id="@+id/tv_huancun"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:drawableRight="@mipmap/icon_qianwang"
                android:padding="@dimen/dp_10" />
        </LinearLayout>

//接下來 activity的東西
//提全域性
private TextView tv_huancun;
//找佈局
tv_huancun = findViewById(R.id.tv_huancun);
//點選事件
tv_huancun.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
MyDialogPop.getInstance().getCommonDialog(SystemSettingsActivity.this, R.layout.layout_commondialog, (int) (ScreenSizeUtils.getScreenWidth() * 0.9f),
WindowManager.LayoutParams.WRAP_CONTENT, Gravity.CENTER, true, new MyDialogPop.MyDialogView() {
@Override
public void setView(final Dialog dialog, View view) {
TextView textView = view.findViewById(R.id.tv_title);
TextView tv_content = view.findViewById(R.id.tv_content);
TextView tv_clear = view.findViewById(R.id.tv_clear);
TextView tv_quding = view.findViewById(R.id.tv_quding);
textView.setText(「清除快取」);
tv_content.setText(「確認要清楚快取？」);
tv_clear.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
dialog.dismiss();
}
});
tv_quding.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
dialog.dismiss();
CacheUtil.clearAllCache(SystemSettingsActivity.this);
ToastFactory.getToast(SystemSettingsActivity.this, 「快取清除成功」);
try {
tv_huancun.setText(CacheUtil.getTotalCacheSize(SystemSettingsActivity.this));
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
});
}
});

//dialog的佈局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/ova_dialog_input"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tv_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="20dp"
        android:text="溫馨提示"
        android:textColor="@color/floor_text_uncolor"
        android:textSize="17sp" />


    <TextView
        android:id="@+id/tv_content"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="20dp"
        android:layout_marginTop="5dp"
        android:layout_marginRight="20dp"
        android:gravity="center"
        android:padding="8dp"
        android:textColor="@color/floor_text_uncolor"
        android:textSize="15sp" />

    <View
        android:id="@+id/v_xian"
        style="@style/line_padding_parent"
        android:layout_marginTop="10dp" />

    <View
        android:id="@+id/v_xian_zanwei"
        style="@style/line_padding_parent"
        android:layout_marginTop="10dp"
        android:visibility="gone" />

    <LinearLayout
        android:id="@+id/ll_anniu"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/tv_clear"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="10dp"
            android:text="取消"
            android:textColor="@color/floor_text_uncolor"
            android:textSize="15sp" />

        <View
            android:layout_width="0.5dp"
            android:layout_height="match_parent"
            android:background="@color/color_gray" />


        <TextView
            android:id="@+id/tv_quding"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="center"
            android:padding="10dp"
            android:text="確定"
            android:textColor="@color/floor_text_uncolor"
            android:textSize="15sp" />
    </LinearLayout>


</LinearLayout>

//ova_dialog_input一個灰白色帶弧度的的背景

<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle" >

    <solid android:color="@color/colorwrite" />

    <corners
        android:radius="5dp" />

</shape>

//這裡style裡面的，是dialog的樣式和動畫，以及分割線的樣式

<style name="NormalDialogStyleBottom">
        <!--對話方塊背景 -->
        <item name="android:windowBackground">@android:color/transparent</item>
        <!--邊框 -->
        <item name="android:windowFrame">@null</item>
        <!--沒有標題 -->
        <item name="android:windowNoTitle">true</item>
        <!-- 是否浮現在Activity之上 -->
        <item name="android:windowIsFloating">true</item>
        <!--背景透明-->
        <item name="android:windowIsTranslucent">false</item>
        <!-- 是否有覆蓋 -->
        <item name="android:windowContentOverlay">@null</item>
        <!--進出的顯示動畫 -->
        <item name="android:windowAnimationStyle">@style/normalDialogAnim</item>
        <!--背景變暗-->
        <item name="android:backgroundDimEnabled">true</item>
    </style>
    <!--對話方塊動畫-->
    <style name="normalDialogAnim" parent="android:Animation">
        <item name="android:windowEnterAnimation">@anim/anim_bottom_in</item>
        <item name="android:windowExitAnimation">@anim/anim_bottom_out</item>
    </style>
    <style name="line_padding_parent">
        <item name="android:layout_width">match_parent</item>
        <item name="android:layout_height">0.5dp</item>
        <item name="android:layout_marginLeft">10dp</item>
        <item name="android:layout_marginRight">10dp</item>
        <item name="android:background">@color/color_gray</item>
    </style>

//還有兩個小東西，dialog顯示的動畫，dialog隱藏的動畫

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="400"
        android:fromYDelta="100%p" />
</set>

<set xmlns:android="http://schemas.android.com/apk/res/android">
    <translate
        android:duration="400"
        android:toYDelta="100%p" />
</set>

齊活