Java 通过用户选择在imageview中添加图片
我想将图片添加到一个图像视图中,并在一行中添加文本纹理。此代码正在打开库并让我选择一张图片。但是,当选择图片时,图片将不会显示在图像纹理中。我从这个链接获取了代码 [ 这是我的密码Java 通过用户选择在imageview中添加图片,java,android,Java,Android,我想将图片添加到一个图像视图中,并在一行中添加文本纹理。此代码正在打开库并让我选择一张图片。但是,当选择图片时,图片将不会显示在图像纹理中。我从这个链接获取了代码 [ 这是我的密码 image.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent i
image.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent i = new Intent(
Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
}
});
及
这是xml
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:padding="1dp"
android:background="@color/Black"
android:layout_marginTop="10dp"
android:layout_width="300dp"
android:layout_height="wrap_content"
android:id="@+id/image"
android:layout_weight="0.5"
/>
<TextView
android:layout_marginTop="10dp"
android:text="TextView"
android:layout_width="match_parent"
android:singleLine="true"
android:layout_gravity="right"
android:background="@color/White"
android:layout_height="wrap_content"
android:id="@+id/child"
android:textSize="24sp"/>
</LinearLayout>
我想您忘记了读取外部存储的权限
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
您需要请求手动许可:
if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{Manifest.permission.READ_EXTERNAL_STORAGE},
1);
}
在它覆盖之后:
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}
}
API级别21之后,需要手动请求权限。您可以使用Log.d(“标记”、“图片路径:”+picturePath);如果日志未显示,您可以检查生成版本代码、Android版本M或更高要求的权限读取外部存储。如果日志显示,您可以检查绝对路径图像并搜索“从外部存储加载位图”.我希望我的回答能对你有所帮助!
@Override
public void onRequestPermissionsResult(int requestCode,
String permissions[], int[] grantResults) {
switch (requestCode) {
case 1: {
// If request is cancelled, the result arrays are empty.
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// permission was granted, yay! Do the
// contacts-related task you need to do.
} else {
// permission denied, boo! Disable the
// functionality that depends on this permission.
Toast.makeText(MainActivity.this, "Permission denied to read your External storage", Toast.LENGTH_SHORT).show();
}
return;
}
// other 'case' lines to check for other
// permissions this app might request
}