[英]want to transfer the image from one activity to another
在這里,我有兩個Activity
。在第一個活動中,我想從圖庫中選擇一個圖像並將該圖像傳輸到第二個活動並設置該活動的圖像視圖。
我通過意圖將圖像的路徑轉移到另一個活動,但它不適用於所有圖像。 我只能從圖庫中獲取一些圖像,對於某些圖像,它將關閉我的應用程序或顯示任何內容並返回第一個活動。
如何改進我的代碼以適用於所有圖像。 我檢查了很多次,我認為問題在於傳輸文件路徑並將其轉換為另一個活動。
我的第一項活動:
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();
}
}
}
}
我的第二項活動
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();
}
}
在你的第一個MainActivity里面位圖聲明“public static”如下代碼:
class MainActivity extends AppCompatActivity implements View.OnClickListener {
Button choose;
public static 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);
startActivity(new Intent(getApplicationContext(), SecondActivity.class));
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
和SecondActivity訪問代碼:
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= MainActivity.bitmap ;
image.setImageBitmap(bitmap);
}
}
對於小尺寸圖像,它是好的(通過位圖),但是對於大尺寸,你需要做更多的工作......按照這個文檔,它是用文檔編寫的。 https://developer.android.com/training/camera/photobasics.html
而不是傳遞位圖,將filePath傳遞給下一個活動,並在第二個活動中生成位圖並進行設置。
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