android圖片尺寸大小設定
阿新 • • 發佈：2018-12-27
貼上程式碼，以後直接複製貼上使用，不用再計算，再百度了！！
方法一：（按照圖片尺寸設定、方法中viewRootBanner為圖片或者裝載圖片的控制元件banner）
例如：750*286尺寸 的圖片
//設定圖片寬高比
float scale = (float) 750 / (float) 286;
int screenWidth;
//獲取螢幕的寬度
WindowManager wm = (WindowManager) getBaseActivity().getSystemService(Context.WINDOW_SERVICE);
Point size = new Point();
wm.getDefaultDisplay().getSize(size);
screenWidth = size.x;
//計算BGABanner的應有高度
int viewHeight = Math.round(screenWidth / scale);
//設定BGABanner的寬高屬性
ViewGroup.LayoutParams banner_params = viewRootBanner 方法二：（按照圖片比例設定，方法中viewRootBanner為圖片或者裝載圖片的控制元件banner，Util為工具類，方法在下面）
例如：1.87：1 的圖片比例
int width = Util.getPixbyPercent(1, getBaseActivity(), Util.Horizontal); int heigh = (int) (width / 1.87); //banner圖片寬高比例1.87:1ViewGroup.LayoutParams layoutParams = viewRootBanner.getLayoutParams(); layoutParams.width = width; layoutParams.height = heigh; viewRootBanner.setLayoutParams(layoutParams);
方法三：（imageView為圖片，Util為工具類，方法在下面）
imageView = (ImageView) itemView.findViewById(R.id.class_list_image);
int fullwidth = Util.getPixbyPercent(1, (BaseActivity)mContext, Util.Horizontal);
int width = fullwidth - Util.dip2px(mContext, 32);
int height = 0;
height = (int) (width/2 * 1.47);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, height);
imageView 方法二、方法三中用到的方法：（裡面的生成二維碼方法需要依賴，依賴見下面第一行，如果有其他錯誤，用不到的可直接刪掉，我這裡就不刪了）
implementation 'com.google.zxing:core:3.3.0'public class Util {
public static final int Horizontal = 0;
public static final int Vertical = 1;
private static DisplayMetrics dm = null;
/**
* 根據手機的解析度從 dp 的單位 轉成為 px(畫素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}
/**
* 根據手機的解析度從 px(畫素) 的單位 轉成為 dp
*/
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
private static DisplayMetrics getDisplayMetrics(Activity activity) {
if (dm == null) {
dm = new DisplayMetrics();
activity.getWindowManager().getDefaultDisplay().getMetrics(dm);
}
return dm;
}
/**
* @param percent 百分比
* @param activity 用於獲取本機解析度
* @param orientation ZichanjiaUtil.Horizontal 返回橫向百分比, 其他則 返回縱向百分比,
* @return
*/
public static int getPixbyPercent(double percent, Activity activity,
int orientation) {
DisplayMetrics dm = getDisplayMetrics(activity);
int screenW = dm.widthPixels; // 獲取解析度寬度
int screenH = dm.heightPixels; // 獲取解析度高度
return Horizontal == orientation ? (int) (screenW * percent)
: (int) (screenH * percent);
}
/**
* 隱藏輸入法
*
* @param context
*/
public static void hideInputMethod(Context context)
{
InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
if (imm.isActive())
{
imm.toggleSoftInput(InputMethodManager.RESULT_UNCHANGED_SHOWN, InputMethodManager.HIDE_NOT_ALWAYS);
}
}
/**
* 顯示輸入法
*
* @param context
* @param view
* @param requestFocus
*/
public static void showInputMethod(Context context, View view, boolean requestFocus)
{
if (requestFocus)
{
view.requestFocus();
}
InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
imm.showSoftInput(view, InputMethodManager.SHOW_FORCED);
}
public static int getIntFromString(String content, int defaultValue)
{
if (!TextUtils.isEmpty(content))
{
try
{
return Integer.parseInt(content);
} catch (Exception e)
{
return defaultValue;
}
} else
{
return defaultValue;
}
}
/**
* 將毫秒轉化成 yyyy-MM-dd HH:mm:ss的字串
* @param milSec 毫秒
* @return
*/
public static String milToStringlong(Long milSec)
{
return milToStringlong(milSec, "yyyy-MM-dd HH:mm:ss");
}
public static String milToStringlong(Long milSec, String pattern)
{
Date dateNow = new Date(milSec);
SimpleDateFormat formatter = new SimpleDateFormat(pattern);
String dateStrLong = formatter.format(dateNow);
return dateStrLong;
}
/**
* 將字串的yyyy-MM-dd HH:mm:ss 轉化為毫秒
* @param dateStrlong yyyy-MM-dd HH:mm:ss
* @return
*/
public static long stringLongToMil(String dateStrlong)
{
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
try
{
Date date = formatter.parse(dateStrlong);
long milSec = date.getTime();
return milSec;
} catch (ParseException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return 0;
}
/**
* 計算收益
* @param bidMoney
* @param investModel
* @return
*/
public static double cacleEarningsMoney(double bidMoney, InvestModel investModel){
double earningsMoney = 0;
earningsMoney = bidMoney * Double.parseDouble(investModel.getRate()) / 100 / 360 * Double.parseDouble(investModel.getRepay_time());
return earningsMoney;
}
public static double cacleEarningsMoney(double bidMoney, double rate, double repayTime){
double earningsMoney = 0;
earningsMoney = bidMoney * rate / 100 / 360 * repayTime;
return earningsMoney;
}
/**
* 獲取版本號
* @return 當前應用的版本號
*/
public static String getVersion(Context context) {
try {
PackageManager manager = context.getPackageManager();
PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
String version = info.versionName;
return version;
} catch (Exception e) {
e.printStackTrace();
return "未知版本號";
}
}
public static byte[] bmpToByteArray(final Bitmap bmp, final boolean needRecycle) {
ByteArrayOutputStream output = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.PNG, 100, output);
if (needRecycle) {
bmp.recycle();
}
byte[] result = output.toByteArray();
try {
output.close();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 生成二維碼
* @param text
* @param size
* @return
*/
public static Bitmap createQRCode(String text, int size) {
try {
Hashtable<EncodeHintType, Object> hints = new Hashtable<>();
hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.L);
hints.put(EncodeHintType.MARGIN, 0);
BitMatrix bitMatrix = new QRCodeWriter().encode(text,
BarcodeFormat.QR_CODE, size, size, hints);
int[] pixels = new int[size * size];
for (int y = 0; y < size; y++) {
for (int x = 0; x < size; x++) {
if (bitMatrix.get(x, y)) {
pixels[y * size + x] = 0xff000000;
} else {
pixels[y * size + x] = 0xffffffff;
}
}
}
Bitmap bitmap = Bitmap.createBitmap(size, size,
Bitmap.Config.ARGB_8888);
bitmap.setPixels(pixels, 0, size, 0, 0, size, size);
return bitmap;
} catch (WriterException e) {
e.printStackTrace();
return null;
}
}
}