android 数据库保存图片视屏路径，出现Unable to decode stream: java.io.FileNotFoundException: nu

[qq_15590071]

本人anroid小白一枚，求大神帮忙解决

[qq_15590071]

addcontent.java /* Unable to decode stream: java.io.FileNotFoundException: null: open failed: ENOENT (No such file or directory) 当控件是ImageView的时候，他只分了两种情况，一种是资源ID，一种是文件地址，我传入的数据是Bitmap类型的数据， 在这里当然就当成了文件地址来处理，自然就会有FileNotFoundException。知道了原因，解决方案就呼之欲出了， 就是自己重写这个类， 增加一种情况当数据类型是Bitmap的时候怎么处理，然后就轻松自在的解决了*/ package com.example.hellonotes_pratices; import java.io.File; import java.io.IOException; import java.net.MalformedURLException; import java.net.URL; import java.text.SimpleDateFormat; import java.util.Date; import android.app.Activity; import android.content.ContentValues; import android.content.Intent; import android.database.sqlite.SQLiteDatabase; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.os.Bundle; import android.os.Environment; import android.preference.PreferenceManager.OnActivityResultListener; import android.provider.MediaStore; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.VideoView; public class AddContent extends Activity implements OnClickListener { private String val; private Button savebtn, deletebtn; private EditText ettext; private ImageView c_img; private VideoView v_video; private NotesDB notesDB; private SQLiteDatabase dbWriter; private File phoneFile, videoFile; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.addcontent); val = getIntent().getStringExtra("flag"); savebtn = (Button) findViewById(R.id.save); deletebtn = (Button) findViewById(R.id.delete); ettext = (EditText) findViewById(R.id.ettext); c_img = (ImageView) findViewById(R.id.c_img); v_video = (VideoView) findViewById(R.id.c_video); savebtn.setOnClickListener(this); deletebtn.setOnClickListener(this); notesDB = new NotesDB(this); dbWriter = notesDB.getWritableDatabase(); initView(); } private void addDB(){ ContentValues c = new ContentValues(); c.put(NotesDB.CONTENT, ettext.getText().toString()); c.put(NotesDB.TIME, getTime() ); c.put(NotesDB.PATH, phoneFile+""); c.put(NotesDB.VIDEO, videoFile+""); dbWriter.insert(NotesDB.TABLE_NAME,null,c); } private String getTime() { SimpleDateFormat format = new SimpleDateFormat("yyy年MM月dd日HH:mm:ss"); Date date = new Date(); String string = format.format(date); return string; } private void initView() { if( val.equals("text") ){ c_img.setVisibility(View.GONE); v_video.setVisibility(View.GONE); } if( val.equals("img") ){ c_img.setVisibility(View.VISIBLE); v_video.setVisibility(View.GONE); Intent imgIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE); //图片绝对路径 phoneFile = new File(Environment.getExternalStorageDirectory()+"/" +getTime()+".jpg"); // imgIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(phoneFile)); startActivityForResult(imgIntent, 2); } if( val.equals("video") ){ c_img.setVisibility(View.GONE); v_video.setVisibility(View.VISIBLE); Intent videoIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE); //图片绝对路径 videoFile = new File(Environment.getExternalStorageDirectory()+"/" +getTime()+".mp4"); // videoIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(videoFile)); startActivityForResult(videoIntent, 3); } } @Override public void onClick(View v) { switch (v.getId()) { case R.id.save: addDB(); finish(); break; case R.id.delete: finish(); break; } } //? @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { super.onActivityResult(requestCode, resultCode, data); if(requestCode == 2){ //获取路径 Bitmap bitmap = BitmapFactory.decodeFile( phoneFile.getAbsolutePath() ); c_img.setImageBitmap(bitmap); } if(requestCode == 3){ v_video.setVideoURI(Uri.fromFile(videoFile)); v_video.start(); } } }

[qq_15590071]

Mainactivity类 package com.example.hellonotes_pratices; import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.Button; import android.widget.ListView; public class MainActivity extends Activity implements OnClickListener { private static final String myb = "MainActivity"; private Button textbtn, imgbtn, videobtn; private ListView lv; private Intent i; private MyAdapter adapter; private NotesDB notesDB; private SQLiteDatabase dbReader; private Cursor cursor; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } public void initView() { lv = (ListView) findViewById(R.id.list); textbtn = (Button) findViewById(R.id.text); imgbtn = (Button) findViewById(R.id.img); videobtn = (Button) findViewById(R.id.video); textbtn.setOnClickListener(this); imgbtn.setOnClickListener(this); videobtn.setOnClickListener(this); notesDB = new NotesDB(this); dbReader = notesDB.getReadableDatabase(); lv.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { cursor.moveToPosition(position); Intent i = new Intent(MainActivity.this, SelectAct.class); i.putExtra(NotesDB.ID, cursor.getInt(cursor.getColumnIndex(NotesDB.ID))); i.putExtra(NotesDB.CONTENT, cursor.getString(cursor .getColumnIndex(NotesDB.CONTENT))); i.putExtra(NotesDB.TIME, cursor.getString(cursor.getColumnIndex(NotesDB.TIME))); i.putExtra(NotesDB.PATH, cursor.getString(cursor.getColumnIndex(NotesDB.PATH))); i.putExtra(NotesDB.VIDEO, cursor.getString(cursor.getColumnIndex(NotesDB.VIDEO))); startActivity(i); } }); } @Override public void onClick(View v) { i = new Intent(this, AddContent.class); switch (v.getId()) { case R.id.text: i.putExtra("flag", "text"); startActivity(i); break; case R.id.img: i.putExtra("flag", "img"); startActivity(i); break; case R.id.video: i.putExtra("flag", "video"); startActivity(i); break; } } public void selectDB() { cursor = dbReader.query(NotesDB.TABLE_NAME, null, null, null, null, null, null); adapter = new MyAdapter(this, cursor); lv.setAdapter(adapter); } @Override protected void onResume() { super.onResume(); selectDB(); Log.i(myb, "onResume() finished"); } }

[qq_15590071]

重写adapter类 package com.example.hellonotes_pratices; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BitmapFactory.Options; import android.media.ThumbnailUtils; import android.provider.MediaStore; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.LinearLayout; import android.widget.TextView; public class MyAdapter extends BaseAdapter { private Context context; private Cursor cursor; private LinearLayout linearLayout; public MyAdapter(Context context, Cursor cursor){ this.context = context; this.cursor = cursor; } @Override public int getCount() { return cursor.getCount(); } @Override public Object getItem(int position) { return cursor.getPosition(); } @Override public long getItemId(int position) { return position; } public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = LayoutInflater.from(context); linearLayout = (LinearLayout) inflater.inflate(R.layout.cell, null); TextView contenttv = (TextView) linearLayout.findViewById(R.id.list_content); TextView timetv = (TextView) linearLayout.findViewById(R.id.list_time); ImageView imgiv = (ImageView) linearLayout.findViewById(R.id.list_img); ImageView videoiv = (ImageView) linearLayout.findViewById(R.id.list_video); cursor.moveToPosition(position); String context = cursor.getString( cursor.getColumnIndex("content") ); String time = cursor.getString( cursor.getColumnIndex("time") ); String url = cursor.getString( cursor.getColumnIndex("path") ); String videoUri = cursor.getString( cursor.getColumnIndex("video") ); contenttv.setText(context); timetv.setText(time); imgiv.setImageBitmap(getImageTBitmap(url, 200, 200)); videoiv.setImageBitmap(getVideoThumbnail(videoUri, 200, 200, MediaStore.Images.Thumbnails.MICRO_KIND)); return linearLayout; } //获取图片缩略图 public Bitmap getImageTBitmap(String url, int width, int height){ Bitmap bitmap = null; // ? BitmapFactory.Options options = new BitmapFactory.Options(); // 首先我们把这个图片转成Bitmap，然后再利用Bitmap的getWidth()和getHeight()方法就可以取到图片的宽高了。 // 新问题又来了，在通过BitmapFactory.decodeFile(String path)方法将突破转成Bitmap时，遇到大一些的图片，我们经常会遇到OOM(Out Of Memory)的问题。怎么避免它呢？ // 这就用到了我们上面提到的BitmapFactory.Options这个类。 // BitmapFactory.Options这个类，有一个字段叫做 inJustDecodeBounds 。SDK中对这个成员的说明是这样的： // If set to true, the decoder will return null (no bitmap), but the out… // 也就是说，如果我们把它设为true，那么BitmapFactory.decodeFile(String path, Options opt)并不会真的返回一个Bitmap给你，它仅仅会把它的宽，高取回来给你，这样就不会占用太多的内存，也就不会那么频繁的发生OOM了。 options.inJustDecodeBounds = true; bitmap = BitmapFactory.decodeFile(url, options); // options.inJustDecodeBounds = false; int beWidth = options.outWidth/width; int beHeight = options.outHeight/height; int be = 1; if( beWidth < beHeight){ be = beWidth; }else{ be = beHeight; } if( be <= 0){ be=1; } options.inSampleSize = be; //? bitmap = BitmapFactory.decodeFile(url, options); bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT); return bitmap; } private Bitmap getVideoThumbnail(String uri, int width, int height, int kind) { Bitmap bitmap = null; bitmap = ThumbnailUtils.createVideoThumbnail(uri, kind); bitmap = ThumbnailUtils.extractThumbnail(bitmap, width, height, ThumbnailUtils.OPTIONS_RECYCLE_INPUT); return bitmap; } }

[liaoch12138]

极客学院看的？？4,.4以上好像不支持。

[hellozmz]

请问，这个问题解决了么?我也在这折腾好久了，交流一下啊

[erqulu5071]

我解决了 能在6.0版本上运行。

[louxi1114]

有谁解决了吗?

[sinat_16739689]

引用 6 楼 erqulu5071 的回复:

我解决了 能在6.0版本上运行。

请问怎么解决的可不可以贴一下关键代码。。。

[水月沐风]

照抄谁不会，关键是怎么解决的问题

[水月沐风]

可能是权限没加 <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />