【发布时间】：2018-02-04 20:27:53
【问题描述】：
在这里，我有两个Activity。在第一个活动中，我想从图库中选择一个图像并将该图像传输到第二个活动并设置该活动的图像视图。
我有意将图像的路径转移到另一个活动，但它不适用于所有图像。我只能从图库中获取一些图像，对于某些图像，它会关闭我的应用程序或什么都不显示并返回第一个活动。
如何改进我的代码以适用于所有图像。我检查了很多次，我认为问题在于传输文件路径并将其放入另一个活动中。
我的第一个活动：
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button choose;
private Bitmap bitmap;
private int PICK_IMAGE_REQUEST = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
choose = (Button) findViewById(R.id.choose);
choose.setOnClickListener(this);
}
@Override
public void onClick(View view) {
if (view == choose) {
showFileChooser();
}
}
private void showFileChooser() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
Uri filePath = data.getData();
try {
//Getting the Bitmap from Gallery
bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), filePath);
Intent i = new Intent(getApplicationContext(), SecondActivity.class);
i.putExtra("picture", bitmap);
startActivity(i);
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
我的第二个活动
public class SecondActivity extends AppCompatActivity implements View.OnClickListener {
ImageView image;
Button upload;
Bitmap bitmap;
SharedPreferences sp;
String rollno;
private String UPLOAD_URL ="http://aptronnoida.com/applock/image_insert.php";
private String KEY_Rollno = "rollno";
private String KEY_IMAGE = "image";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
image=(ImageView)findViewById(R.id.image);
bitmap= getIntent().getParcelableExtra("picture") ;
image.setImageBitmap(bitmap);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
upload = (Button) findViewById(R.id.upload);
upload.setOnClickListener(this);
sp=getSharedPreferences("rajput",MODE_PRIVATE);
rollno=sp.getString("rollno",null);
}
@Override
public void onClick(View view) {
if(view == upload){
uploadImage();
}
}
public String getStringImage(Bitmap bmp){
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bmp.compress(Bitmap.CompressFormat.JPEG, 100, baos);
byte[] imageBytes = baos.toByteArray();
String encodedImage = Base64.encodeToString(imageBytes, Base64.DEFAULT);
return encodedImage;
}
private void uploadImage() {
final ProgressDialog loading = ProgressDialog.show(this,"Uploading...","Please wait...",false,false);
StringRequest stringRequest = new StringRequest(Request.Method.POST, UPLOAD_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String s) {
//Disimissing the progress dialog
loading.dismiss();
//Showing toast message of the response
Toast.makeText(SecondActivity.this, s , Toast.LENGTH_LONG).show();
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError volleyError) {
//Dismissing the progress dialog
loading.dismiss();
//Showing toast
Toast.makeText(SecondActivity.this, "Error", Toast.LENGTH_LONG).show();
}
}){
@Override
protected Map<String, String> getParams() throws AuthFailureError {
//Converting Bitmap to String
String image = getStringImage(bitmap);
//Creating parameters
Map<String,String> params = new Hashtable<String, String>();
//Adding parameters
/*params.put(KEY_Rollno,rollno);*/
params.put(KEY_IMAGE, image);
//returning parameters
return params;
}
};
//Creating a Request Queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
//Adding request to the queue
requestQueue.add(stringRequest);
}
@Override
public boolean onSupportNavigateUp(){
onBackPressed();
return true;
}
public void onBackPressed(){
super.finish();
}
}
【问题讨论】：
-
你在看什么错误提及错误详情
-
我认为您应该将文件路径传递给下一个活动并在那里创建位图，您可能会因为文件大小而遇到问题
标签： android