当我打开 Activity 时，我请求目录权限。一旦获得许可，我就写下文件的名称和内容，然后按下保存按钮。保存文件前会有一个确认对话框。我在那里选择是，然后出现以下错误。
2019-07-17 04:29:31.063 17879-17879/com.halimlab.catatanharian E/WindowManager: android.view.WindowLeaked: Activity com.halimlab.catatanharian.InsertAndViewActivity has leaked window DecorView@56fdc15[InsertAndViewActivity] that was originally added here
at android.view.ViewRootImpl.<init>(ViewRootImpl.java:538)
at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:346)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:94)
at android.app.Dialog.show(Dialog.java:329)
at androidx.appcompat.app.AlertDialog$Builder.show(AlertDialog.java:1007)
at com.halimlab.catatanharian.InsertAndViewActivity.konfirmasiSave(InsertAndViewActivity.java:191)
at com.halimlab.catatanharian.InsertAndViewActivity.onBackPressed(InsertAndViewActivity.java:197)
at com.halimlab.catatanharian.InsertAndViewActivity.buatDanUbah(InsertAndViewActivity.java:177)
at com.halimlab.catatanharian.InsertAndViewActivity$1.onClick(InsertAndViewActivity.java:188)
at androidx.appcompat.app.AlertController$ButtonHandler.handleMessage(AlertController.java:167)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:193)
at android.app.ActivityThread.main(ActivityThread.java:6739)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:495)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:859)
这是我的代码。
public class InsertAndViewActivity extends AppCompatActivity implements View.OnClickListener {
public static final int REQUEST_CODE_STORAGE = 100;
int eventID = 0;
EditText edtFileName, edtContent;
Button btnSimpan;
boolean isEditable = false;
String fileName = "";
String tempCatatan = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_insert_and_view);
// button back
ActionBar menu = getSupportActionBar();
menu.setDisplayShowHomeEnabled(true);
menu.setDisplayHomeAsUpEnabled(true);
// input
edtFileName = findViewById(R.id.editFilename);
edtContent = findViewById(R.id.editContent);
// button
btnSimpan = findViewById(R.id.btnSimpan);
btnSimpan.setOnClickListener(this);
Bundle extras = getIntent().getExtras();
if (extras != null) {
fileName = extras.getString("filename");
edtFileName.setText(fileName);
getSupportActionBar().setTitle("Ubah Catatan");
} else {
getSupportActionBar().setTitle("Tambah Catatan");
}
eventID = 1;
if (Build.VERSION.SDK_INT >= 23) {
if (periksaIzin()) {
bacaFile();
}
} else {
bacaFile();
}
}
@Override
public void onClick(View view) {
switch (view.getId()){
case R.id.btnSimpan :
eventID = 2;
if (!tempCatatan.equals(edtContent.getText().toString())) {
if (Build.VERSION.SDK_INT >= 23) {
konfirmasiSave();
}
} else {
konfirmasiSave();
}
break;
}
}
public boolean periksaIzin() {
if (Build.VERSION.SDK_INT >= 23) {
if (checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == getPackageManager().PERMISSION_GRANTED) {
return true;
} else {
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQUEST_CODE_STORAGE);
return false;
}
} else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case REQUEST_CODE_STORAGE :
if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (eventID == 1) {
bacaFile();
} else {
konfirmasiSave();
}
}
break;
}
}
void bacaFile() {
String path = Environment.getExternalStorageDirectory().toString() + "/halimlab.catatan";
File file = new File(path, edtFileName.getText().toString());
if (file.exists()) {
StringBuilder text = new StringBuilder();
try {
BufferedReader br = new BufferedReader(new FileReader(file));
String line = br.readLine();
while (line != null) {
text.append(line);
line = br.readLine();
}
br.close();
} catch (Exception e) {
System.out.println("ERROR" + e.getMessage());
}
tempCatatan = text.toString();
edtContent.setText(text.toString());
}
}
void buatDanUbah() {
String state = Environment.getExternalStorageState();
if (!Environment.MEDIA_MOUNTED.equals(state)) {
return;
}
String path = Environment.getExternalStorageDirectory().toString() + "/halimlab.catatan";
File parent = new File(path);
if (parent.exists()) {
File file = new File(path, edtFileName.getText().toString());
FileOutputStream outputStream = null;
try {
file.createNewFile();
outputStream = new FileOutputStream(file);
OutputStreamWriter streamWriter = new OutputStreamWriter(outputStream);
streamWriter.append(edtContent.getText());
streamWriter.flush();
streamWriter.close();
streamWriter.flush();
streamWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
} else {
parent.mkdir();
File file = new File(path, edtFileName.getText().toString());
FileOutputStream outputStream = null;
try {
file.createNewFile();
outputStream = new FileOutputStream(file, false);
outputStream.write(edtContent.getText().toString().getBytes());
outputStream.flush();
outputStream.close();
} catch (Exception e) {
e.printStackTrace();
}
}
onBackPressed();
}
void konfirmasiSave () {
new AlertDialog.Builder(this)
.setTitle("Simpan Catatan")
.setMessage("Apakah anda akan menyimpan catatan ini ?")
.setIcon(android.R.drawable.ic_dialog_alert)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
buatDanUbah();
}
})
.setNegativeButton(android.R.string.no, null).show();
}
@Override
public void onBackPressed() {
if (!tempCatatan.equals(edtContent.getText().toString())) {
konfirmasiSave();
}
super.onBackPressed();
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
if (item.getItemId() == R.id.home) {
onBackPressed();
}
return super.onOptionsItemSelected(item);
}
}
我在我的 AndroidManifest.xml 中拥有必要的权限。
<uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name = "android.permission.READ_EXTERNAL_STORAGE"/>
最佳答案
您需要像下面这样修改onBackPressed 函数。
@Override
public void onBackPressed() {
if (!tempCatatan.equals(edtContent.getText().toString()))
konfirmasiSave();
else super.onBackPressed(); // Do that in the else part.
}
因为在 konfirmasiSave 函数中，您正在打开一个未关闭的对话框或正在对其执行任何操作，因此您正在调用 super.onBackPressed正试图返回到先前的 Activity ，因此导致窗口泄漏错误。
并在退出前处理 tempCatatan 变量的值，以便您的 onBackPressed 函数按预期执行。
关于java - 在外部 Android 存储中保存文件时出错，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/57065829/