Android 如何在保存多个图像时消除此问题
我正在开发一个图像应用程序,图像会随着按钮的点击而改变。当我保存ImageView的图像时,它会保存到设备中,当我保存另一个图像时,第一个图像会被删除。因此,我重新录制无法保存多个图像。请帮忙。 这里是主要的java代码Android 如何在保存多个图像时消除此问题,android,image,button,save,Android,Image,Button,Save,我正在开发一个图像应用程序,图像会随着按钮的点击而改变。当我保存ImageView的图像时,它会保存到设备中,当我保存另一个图像时,第一个图像会被删除。因此,我重新录制无法保存多个图像。请帮忙。 这里是主要的java代码 public class Main extends Activity { private ImageView hImageViewPic; private Button iButton, gButton; Bitmap bbicon; private int c
public class Main extends Activity {
private ImageView hImageViewPic;
private Button iButton, gButton;
Bitmap bbicon;
private int currentImage = 0;
int[] images = { R.drawable.r1, R.drawable.r2, R.drawable.r3, R.drawable.r4, R.drawable.r5, R.drawable.r6, R.drawable.r7, R.drawable.r8, R.drawable.r9, R.drawable.r10 };
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
hImageViewPic = (ImageView)findViewById(R.id.idImageViewPic);
iButton = (Button) findViewById(R.id.bNext);
gButton = (Button) findViewById(R.id.bPrev);
//Just set one Click listener for the image
iButton.setOnClickListener(iButtonChangeImageListener);
gButton.setOnClickListener(gButtonChangeImageListener);
}
View.OnClickListener iButtonChangeImageListener = new OnClickListener() {
public void onClick(View v) {
//Increase Counter to move to next Image
currentImage++;
currentImage = currentImage % images.length;
hImageViewPic.setImageResource(images[currentImage]);
}
};
View.OnClickListener gButtonChangeImageListener = new OnClickListener() {
`public void onClick(View v) {
//Increase Counter to move to next Image
currentImage--;
currentImage = (currentImage + images.length) % images.length;
hImageViewPic.setImageResource(images[currentImage]);`
// here we set 3rd button to save the images
Button bSaveImg = (Button) findViewById (R.id.bSave):
ImageView imagePreview = (ImageView) findViewById (R.id.idImageViewPic);
imagePreview.setImageResource (images [currentImage]);
bSaveImg.setOnClickListener (new Button.OnClickListener () {
@Override
public void onClick (View arg0) {
bbicon=BitmapFactory.decodeResource(getResources(),images [cirrentImage]);
//ByteArrayOutputStream baosicon = new ByteArrayOutputStream();
//bbicon.compress(Bitmap.CompressFormat.PNG,0, baosicon);
//bicon=baosicon.toByteArray();
String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
OutputStream outStream = null;
File file = new File(extStorageDirectory, "er.PNG");
try {
outStream = new FileOutputStream(file);
bbicon.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
} catch(Exception e) {
}
}
});
}
};
}
因此,plz有助于消除此问题。更改png文件的名称,例如将png文件的名称与当前时间或日期放在一起,这对于每个图像都是唯一的 改变
File file = new File(extStorageDirectory, "er.PNG");
到
我更喜欢使用DateTime保存图像,因为它是一个唯一的实例
String strFileName=android.text.format.DateFormat.format("dd-MM-yyyy-hh-mm-ssaa", new java.util.Date()).toString();
File file = new File(path, strFileName+ ".png");
另外,请记住,不建议将图像存储在ExtStorageDirectory上。而不是在外部存储器中创建一个文件夹并保存在那里
File sdCard = Environment.getExternalStorageDirectory();
String path = sdCard.getAbsolutePath() + "/YourFolder/";
File dir = new File(path);
if (!dir.exists()) {
if (dir.mkdirs()) {
}
}
为用户编辑
bSaveImg.setOnClickListener (new Button.OnClickListener () {
@Override
public void onClick (View arg0) {
bbicon=BitmapFactory.decodeResource(getResources(),images [cirrentImage]);
//ByteArrayOutputStream baosicon = new ByteArrayOutputStream();
//bbicon.compress(Bitmap.CompressFormat.PNG,0, baosicon);
//bicon=baosicon.toByteArray();
///below code
File sdCard = Environment.getExternalStorageDirectory();
String path = sdCard.getAbsolutePath() + "/YourFolder/";
File dir = new File(path);
if (!dir.exists()) {
if (dir.mkdirs()) {
}
}
OutputStream outStream = null;
///below Code
String strFileName=android.text.format.DateFormat.format("dd-MM-yyyy-hh-mm-ssaa", new java.util.Date()).toString();
File file = new File(path, strFileName+ ".png");
try {
outStream = new FileOutputStream(file);
bbicon.compress(Bitmap.CompressFormat.PNG, 100, outStream);
outStream.flush();
outStream.close();
} catch(Exception e) {
}
}
});
}
不要忘记放置try和catch并检查文件夹是否存在,然后执行其他操作,否则创建文件夹并将下面的行放入清单文件中
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"
您需要动态更改文件名,否则它将覆盖,您将无法获得多个文件。非常感谢您如此漂亮的答复,先生。但我发现了错误。没有捕获(例外e){//那么你能修改我的java吗?这样我就能更好地理解它了。Thanx@3004150请编辑您的问题并发布错误。先生,我不明白如何将您的代码放入java类中。非常感谢先生。如果我想添加用于保存图像的文件夹,请您指导我。Thanx检查我添加了另一个答案OK先生。But图像未显示在gallery中。因为它保存在卡上。如果我想在gallery中看到它,则必须重新启动设备。请查看此图片
//Create Folder
File folder = new File(Environment.getExternalStorageDirectory().toString()+"/Images");
folder.mkdirs();
//Save the path as a string value
String extStorageDirectory = folder.toString();
File file = new File(extStorageDirectory, System.currentTimeMillis()+".PNG");
uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"