包含知识点:

  • 选择图片(相册+拍照)
  • 正方形裁剪
  • 图片压缩
  • 图片点击

图片

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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/ll"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical" >

<Button
android:id="@+id/btnColor"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:text="获取图片" />

<ImageView
android:id="@+id/iv_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:scaleType="fitCenter" />

</LinearLayout>
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package com.wxy.treecalc;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

private TextView tv_rgb;
private ImageView iv_image;
private Bitmap bitmap;
private String TAG = "RGBActivity";
private Button btnColor;
public static final int NONE = 0;
public static final int PHOTOHRAPH = 1;// 拍照
public static final int PHOTOZOOM = 2; // 缩放
public static final int PHOTORESOULT = 3;// 结果
public static final String IMAGE_UNSPECIFIED = "image/*";
public static final String TEMP_JPG_NAME = "temp.jpg";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

tv_rgb = (TextView) findViewById(R.id.textview);
btnColor = (Button) findViewById(R.id.btnColor);
iv_image = (ImageView) findViewById(R.id.iv_image);

btnColor.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
openAlbum();
}
});

iv_image.setOnTouchListener(new OnTouchListener() {

@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
if (event.getAction() == MotionEvent.ACTION_UP) {
int color = bitmap.getPixel(x, y);
// 如果你想做的更细致的话 可以把颜色值的R G B 拿到做响应的处理
int r = Color.red(color);
int g = Color.green(color);
int b = Color.blue(color);
int a = Color.alpha(color);
Log.i(TAG, "r=" + r + ",g=" + g + ",b=" + b);
tv_rgb.setText("a=" + a + ",r=" + r + ",g=" + g + ",b="
+ b);
btnColor.setTextColor(Color.rgb(r, g, b));
}


return true;
}
});
}

// 打开相册
private void openAlbum() {
Intent intent = new Intent(Intent.ACTION_PICK, null);
intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, "image/*");
startActivityForResult(intent, PHOTOZOOM);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
try {
if (resultCode == NONE)
return;

if (data == null)
return;

// 读取相册缩放图片
if (requestCode == PHOTOZOOM) {
if (data != null) {
startPhotoZoom(data.getData());
}
}

// 处理结果
if (requestCode == PHOTORESOULT) {
Bundle extras = data.getExtras();
if (extras != null) {
bitmap = extras.getParcelable("data");
//ByteArrayOutputStream stream = new ByteArrayOutputStream();
comp(bitmap);
//bitmap.compress(Bitmap.CompressFormat.JPEG, 100, stream);
iv_image.setImageBitmap(bitmap);
/* logoName = FileUtils.getFilename(MainAppUtil.getCustom().getSusername());
FileUtils.writeFile(Constants.LOGO_CACHE_PATH, logoName, photo);*/
}
}

super.onActivityResult(requestCode, resultCode, data);
} catch (Exception e) {

e.printStackTrace();
}
}

private Bitmap compressImage(Bitmap image) {

ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法,这里100表示不压缩,把压缩后的数据存放到baos中
int options = 100;
while (baos.toByteArray().length / 1024 > 100) { //循环判断如果压缩后图片是否大于100kb,大于继续压缩
baos.reset();//重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%,把压缩后的数据存放到baos中
options -= 10;//每次都减少10
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片
return bitmap;
}

private Bitmap comp(Bitmap image) {

ByteArrayOutputStream baos = new ByteArrayOutputStream();
image.compress(Bitmap.CompressFormat.JPEG, 100, baos);
if (baos.toByteArray().length / 1024 > 1024) {
//判断如果图片大于1M,进行压缩避免在生成图片(BitmapFactory.decodeStream)时溢出
baos.reset();//重置baos即清空baos
image.compress(Bitmap.CompressFormat.JPEG, 50, baos);
//这里压缩50%,把压缩后的数据存放到baos中
}
ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());
BitmapFactory.Options newOpts = new BitmapFactory.Options();
//开始读入图片,此时把options.inJustDecodeBounds 设回true了
newOpts.inJustDecodeBounds = true;
Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
newOpts.inJustDecodeBounds = false;
int w = newOpts.outWidth;
int h = newOpts.outHeight;
//现在主流手机比较多是800*500分辨率,所以高和宽我们设置为
float hh = 800f;//这里设置高度为800f
float ww = 500f;//这里设置宽度为500f
//缩放比。由于是固定比例缩放,只用高或者宽其中一个数据进行计算即可
int be = 1;//be=1表示不缩放
if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放
be = (int) (newOpts.outWidth / ww);
} else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放
be = (int) (newOpts.outHeight / hh);
}
if (be <= 0)
be = 1;
newOpts.inSampleSize = be;//设置缩放比例
//重新读入图片,注意此时已经把options.inJustDecodeBounds 设回false了
isBm = new ByteArrayInputStream(baos.toByteArray());
bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);
return compressImage(bitmap);//压缩好比例大小后再进行质量压缩
}

private void startPhotoZoom(Uri uri) {
Intent intent = new Intent("com.android.camera.action.CROP");
intent.setDataAndType(uri, IMAGE_UNSPECIFIED);
intent.putExtra("crop", "true");
// aspectX aspectY 是宽高的比例
intent.putExtra("aspectX", 1);
intent.putExtra("aspectY", 1);
// outputX outputY 是裁剪图片宽高
intent.putExtra("outputX", 300);
intent.putExtra("outputY", 300);
intent.putExtra("return-data", true);
startActivityForResult(intent, PHOTORESOULT);
}
}