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27 changes: 26 additions & 1 deletion
27
.../app/src/main/java/edu/hzuapps/androidlabs/com1613090502214/Com1613090502214Activity.java
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48 changes: 48 additions & 0 deletions
48
...90502214/project/app/src/main/java/edu/hzuapps/androidlabs/com1613090502214/ImgUtils.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| package edu.hzuapps.androidlabs.com1613090502214 | ||
| ; | ||
| import android.content.Context; | ||
| import android.content.Intent; | ||
| import android.graphics.Bitmap; | ||
| import android.net.Uri; | ||
| import android.os.Environment; | ||
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| import java.io.File; | ||
| import java.io.FileOutputStream; | ||
| import java.io.IOException; | ||
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| public class ImgUtils { | ||
| //保存文件到指定路径 | ||
| public static boolean saveImageToGallery(Context context, Bitmap bmp) { | ||
| // 首先保存图片 | ||
| String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "demo"; | ||
| File appDir = new File(storePath); | ||
| if (!appDir.exists()) { | ||
| appDir.mkdir(); | ||
| } | ||
| String fileName = System.currentTimeMillis() + ".jpg"; | ||
| File file = new File(appDir, fileName); | ||
| try { | ||
| FileOutputStream fos = new FileOutputStream(file); | ||
| //通过io流的方式来压缩保存图片 | ||
| boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 60, fos); | ||
| fos.flush(); | ||
| fos.close(); | ||
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| //把文件插入到系统图库 | ||
| //MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null); | ||
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| //保存图片后发送广播通知更新数据库 | ||
| Uri uri = Uri.fromFile(file); | ||
| context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri)); | ||
| if (isSuccess) { | ||
| return true; | ||
| } else { | ||
| return false; | ||
| } | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| return false; | ||
| } | ||
| } |
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168 changes: 168 additions & 0 deletions
168
...214/project/app/src/main/java/edu/hzuapps/androidlabs/com1613090502214/ThirdActivity.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| package edu.hzuapps.androidlabs.com1613090502214; | ||
|
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| import android.Manifest; | ||
| import android.content.Context; | ||
| import android.content.Intent; | ||
| import android.graphics.Bitmap; | ||
| import android.graphics.BitmapFactory; | ||
| import android.os.Build; | ||
| import android.os.Bundle; | ||
| import android.os.Handler; | ||
| import android.os.Message; | ||
| import android.support.v7.app.AppCompatActivity; | ||
| import android.util.Log; | ||
| import android.view.View; | ||
| import android.widget.Button; | ||
| import android.widget.EditText; | ||
| import android.widget.ImageView; | ||
| import android.widget.Toast; | ||
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| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.net.MalformedURLException; | ||
| import java.net.URL; | ||
| import java.util.List; | ||
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| import pub.devrel.easypermissions.AppSettingsDialog; | ||
| import pub.devrel.easypermissions.EasyPermissions; | ||
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| public class ThirdActivity extends AppCompatActivity implements EasyPermissions.PermissionCallbacks { | ||
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| private static final int REQUEST_CODE_SAVE_IMG = 10; | ||
| private static final String TAG = "MainActivity"; | ||
| private Context mContext; | ||
| private EditText editText; | ||
| private Button button; | ||
| private Button button1; | ||
| private ImageView imageView; | ||
| private Bitmap bitmap; | ||
| //手柄更新的作用 | ||
| Handler handler=new Handler(){ | ||
| public void handleMessage(Message msg) { | ||
| if(msg.what==111){ | ||
| imageView.setImageBitmap(bitmap); | ||
| } | ||
| }; | ||
| }; | ||
| @Override | ||
| protected void onCreate(Bundle savedInstanceState) { | ||
| super.onCreate(savedInstanceState); | ||
| setContentView(R.layout.activity_third); | ||
| getSupportActionBar().setDisplayHomeAsUpEnabled(true); | ||
| //初始化组件 | ||
| editText=(EditText) findViewById(R.id.editText2); | ||
| button=(Button) findViewById(R.id.download); | ||
| button1=(Button)findViewById(R.id.save) ; | ||
| imageView=(ImageView) findViewById(R.id.imageView); | ||
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| mContext = this; | ||
| button.setOnClickListener(new View.OnClickListener() { | ||
| @Override | ||
| public void onClick(View v) { | ||
| new Thread(t).start(); | ||
|
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| } | ||
| }); | ||
| button1.setOnClickListener(new View.OnClickListener() { | ||
| @Override | ||
| public void onClick(View v) { | ||
| requestPermission(); | ||
| } | ||
| }); | ||
| } | ||
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| //为了下载图片资源，开辟一个新的子线程 | ||
| Thread t=new Thread() { | ||
| public void run() { | ||
| //下载图片的路径 | ||
| String iPath = editText.getText().toString(); | ||
| try { | ||
| //对资源链接 | ||
| URL url = new URL(iPath); | ||
| //打开输入流 | ||
| InputStream inputStream = url.openStream(); | ||
| //对网上资源进行下载转换位图图片 | ||
| bitmap = BitmapFactory.decodeStream(inputStream); | ||
| handler.sendEmptyMessage(111); | ||
| inputStream.close(); | ||
| }catch (MalformedURLException e){ | ||
| e.printStackTrace(); | ||
| }catch (IOException e){ | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| }; | ||
| /** | ||
| * 请求读取sd卡的权限 | ||
| */ | ||
| private void requestPermission() { | ||
| if (Build.VERSION.SDK_INT >= 23) { | ||
| //读取sd卡的权限 | ||
| String[] mPermissionList = new String[]{Manifest.permission.READ_EXTERNAL_STORAGE, Manifest.permission.WRITE_EXTERNAL_STORAGE}; | ||
| if (EasyPermissions.hasPermissions(mContext, mPermissionList)) { | ||
| //已经同意过 | ||
| saveImage(bitmap); | ||
| } else { | ||
| //未同意过,或者说是拒绝了，再次申请权限 | ||
| EasyPermissions.requestPermissions( | ||
| this, //上下文 | ||
| "保存图片需要读取sd卡的权限", //提示文言 | ||
| REQUEST_CODE_SAVE_IMG, //请求码 | ||
| mPermissionList //权限列表 | ||
| ); | ||
| } | ||
| } else { | ||
| saveImage(bitmap); | ||
| } | ||
| } | ||
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| //保存图片 | ||
| private void saveImage(Bitmap bitmap) { | ||
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| boolean isSaveSuccess = ImgUtils.saveImageToGallery(mContext, bitmap); | ||
| if (isSaveSuccess) { | ||
| Toast.makeText(mContext, "保存图片成功", Toast.LENGTH_SHORT).show(); | ||
| } else { | ||
| Toast.makeText(mContext, "保存图片失败，请稍后重试", Toast.LENGTH_SHORT).show(); | ||
| } | ||
| } | ||
|
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| //授权结果，分发下去 | ||
| @Override | ||
| public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { | ||
| super.onRequestPermissionsResult(requestCode, permissions, grantResults); | ||
| // Forward results to EasyPermissions | ||
| //跳转到onPermissionsGranted或者onPermissionsDenied去回调授权结果 | ||
| EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this); | ||
| } | ||
|
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| //同意授权 | ||
| @Override | ||
| public void onPermissionsGranted(int requestCode, List<String> list) { | ||
| Log.i(TAG, "onPermissionsGranted:" + requestCode + ":" + list.size()); | ||
| saveImage(bitmap); | ||
| } | ||
|
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| //拒绝授权 | ||
| @Override | ||
| public void onPermissionsDenied(int requestCode, List<String> perms) { | ||
| Log.i(TAG, "onPermissionsDenied:" + requestCode + ":" + perms.size()); | ||
| if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) { | ||
| //打开系统设置，手动授权 | ||
| new AppSettingsDialog.Builder(this).build().show(); | ||
| } | ||
| } | ||
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| @Override | ||
| protected void onActivityResult(int requestCode, int resultCode, Intent data) { | ||
| super.onActivityResult(requestCode, resultCode, data); | ||
| if (requestCode == AppSettingsDialog.DEFAULT_SETTINGS_REQ_CODE) { | ||
| //拒绝授权后，从系统设置了授权后，返回APP进行相应的操作 | ||
| Log.i(TAG, "onPermissionsDenied:------>自定义设置授权后返回APP"); | ||
| saveImage(bitmap); | ||
| } | ||
| } | ||
| } |
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