[英]How to pass data from Activity to DialogFragment
我知道有一些關於如何將數據從活動傳遞到對話框的示例(即Bundle或Intent)。 但是,我嘗試的所有方法均無效。 我不斷收到NPE和"Unable to find explicit activity class"
錯誤。 即使當我使用對話框構建超基本活動時,它也不起作用。 我必須在代碼中添加什么才能使其正常工作?
主要活動:
public class MainActivity extends AppCompatActivity {
Button button;
String textIWantToSee;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
textIWantToSee = "If this is the text I want to pass form this activity to the Fragment";
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
}
});
}
}
對話:
public class Dialog extends DialogFragment {
TextView textView;
@Override
public android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.dialog_layout, null);
textView = (TextView) v.findViewById(R.id.textView);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v);
return builder.create();
}
}
更新
主要活動:
public class MainActivity extends AppCompatActivity {
TextView tvIntent;
Button button;
String textIWantToSee;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tvIntent = (TextView) findViewById(R.id.tvIntent);
button = (Button) findViewById(R.id.button);
textIWantToSee = "If this is the text I want to pass form this activity to the Fragment";
tvIntent.setText(textIWantToSee);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String intent = String.valueOf(tvIntent);
Intent intentToDialog = new Intent(MainActivity.this, Dialog.class);
intentToDialog.putExtra("keyForIntent", intent);
startActivity(intentToDialog); //Here is the exception
}
});
}
對話框:
public class Dialog extends DialogFragment {
TextView textView;
String intent;
@Override
public android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.dialog_layout, null);
textView = (TextView) v.findViewById(R.id.textView);
Intent intentFromDialog = new Intent(getActivity().getApplicationContext(),MainActivity.class);
intent = intentFromDialog.getStringExtra("keyForIntent");
textView.setText(intent);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v);
return builder.create();
}
}
E/AndroidRuntime: FATAL EXCEPTION: main
Process: nl.blogvandetoekomst.passdatafromactivitytodialog, PID: 2947
android.content.ActivityNotFoundException: Unable to find explicit activity class {nl.blogvandetoekomst.passdatafromactivitytodialog/nl.blogvandetoekomst.passdatafromactivitytodialog.Dialog}; have you declared this activity in your AndroidManifest.xml?
at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:1794)
at android.app.Instrumentation.execStartActivity(Instrumentation.java:1512)
at android.app.Activity.startActivityForResult(Activity.java:3917)
at android.app.Activity.startActivityForResult(Activity.java:3877)
at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:842)
at android.app.Activity.startActivity(Activity.java:4200)
at android.app.Activity.startActivity(Activity.java:4168)
at nl.blogvandetoekomst.passdatafromactivitytodialog.MainActivity$1.onClick(MainActivity.java:36)
at android.view.View.performClick(View.java:5198)
at android.view.View$PerformClick.run(View.java:21147)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
表現:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="nl.blogvandetoekomst.passdatafromactivitytodialog">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
這是將數據從Activity
傳遞到DialogFragment
的方法:
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button button;
String textIWantToSee;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
textIWantToSee = "If this is the text I want to pass form this activity to the Fragment";
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Dialog dialogFragment = new Dialog();
Bundle bundle = new Bundle();
bundle.putString("TEXT",textIWantToSee);
dialogFragment.setArguments(bundle);
dialogFragment.show((MainActivity.this).getSupportFragmentManager(),"Image Dialog");
}
});
}
}
Dialog.java
public class Dialog extends DialogFragment {
TextView textView;
@Override
public android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.dialog_layout, null);
Bundle bundle = getArguments();
String imageLink = bundle.getString("TEXT","");
textView = (TextView) v.findViewById(R.id.textView);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v);
return builder.create();
}
}
您的對話框片段需要一個托管活動,它需要在一個活動中膨脹。
要在MainActivity中膨脹/顯示DialogFragment,請使用:
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Bundle bundle = new Bundle(); //Bundle containing data you are passing to the dialog
bundle.putString("text", textIWantToSee);
Dialog dialog = new Dialog(); //Create a new Dialog
dialog.setArguments(bundle);
dialog.show(getSupportFragmentManager(), "MY_DIALOG_TAG"); //Inflate the dialog
}
});
如果您使用的是支持庫,則應使用android.support.v4.app.DialogFragment而不是android.app.Dialog。 另外,您可以張貼用於顯示對話框的部分代碼嗎?
然后,必須使用OBX指出的DialogFragment框架版本:
MainActivity.java
public class MainActivity extends AppCompatActivity {
Button button;
String textIWantToSee;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button = (Button) findViewById(R.id.button);
textIWantToSee = "If this is the text I want to pass form this activity to the Fragment";
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Dialog dialogFragment = new Dialog();
Bundle bundle = new Bundle();
bundle.putString("TEXT",textIWantToSee);
dialogFragment.setArguments(bundle);
dialogFragment.show(getFragmentManager(),"Image Dialog");
}
});
}
}
Dialog.java
public class Dialog extends DialogFragment {
TextView textView;
@Override
public android.app.Dialog onCreateDialog(Bundle savedInstanceState) {
LayoutInflater inflater = getActivity().getLayoutInflater();
View v = inflater.inflate(R.layout.dialog_layout, null);
Bundle bundle = getArguments();
String imageLink = bundle.getString("TEXT","");
textView = (TextView) v.findViewById(R.id.textView);
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setView(v);
return builder.create();
}
}
這種方式對我來說很好。
編輯:
在onClick中執行此操作時:
Intent intentToDialog = new Intent(MainActivity.this, Dialog.class);
intentToDialog.putExtra("keyForIntent", intent);
startActivity(intentToDialog); //Here is the exception
您沒有啟動活動,Dialog.class是擴展的DialogFragment,無法顯示啟動活動的對話框。 試試我發布的最后一個代碼。
使用Dialog片段的newInstance。 參考: https : //developer.android.com/reference/android/app/DialogFragment.html
static MyDialogFragment newInstance(int num) {
MyDialogFragment f = new MyDialogFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
如果您使用的是Kotlin,請嘗試在隨播對象中定義newInstance
companion object {
fun newInstance(num: Int): MyDialogFragment{
val f = DimensionDialogFragment()
val args = Bundle()
args.putInt("num", num)
f.setArguments(args)
return f
}
}
您可以直接在“活動”中創建對話框:
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
LayoutInflater inflater = MainActivity.this.getLayoutInflater();
View v = inflater.inflate(R.layout.dialog_layout, null);
TextView textView = (TextView) v.findViewById(R.id.textView);
textView.setText(textIWantToSee);
AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
builder.setView(v);
builder.show();
}
});
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