onSaveInstanceState() onRestoreInstanceState() basic Android example
public class MyClass extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
String sMyText = "some text";
int nMyInt = 10;
@Override
protected void onSaveInstanceState(Bundle outState) {
// Save away the original text, so we still have it if the activity
// needs to be killed while paused.
outState.putString("my_text", sMyText);
outState.putInt("my_int", nMyInt);
Toast.makeText(this, "onSaveInstanceState()", Toast.LENGTH_LONG).show();
Log.i("onSaveInstanceState", "onSaveInstanceState()");
}
String sNewMyText = "";
int nNewMyInt = 0;
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
// restore saved values
sNewMyText = savedInstanceState.getString("my_text");
nNewMyInt = savedInstanceState.getInt("my_int");
Toast.makeText(this, "onRestoreInstanceState()", Toast.LENGTH_LONG).show();
Log.i("onRestoreInstanceState", "onRestoreInstanceState()");
}
}
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Problem: erroneous entry of id
Solution: @+id/
<RadioButton android:id="idRadio"
android:text="My radio button"/>
Solution: @+id/
<RadioButton android:id="@+id/idRadio"
android:text="My radio button"/>
build.gradle in module have higher priority then AndrodiManifest.xml
Try this.
AndroidManifest.xml have code:
build.gradle have code:
Warning in AndroidManifest.xml:
Try this.
AndroidManifest.xml have code:
<uses-sdk
android:minSdkVersion="9"
android:targetSdkVersion="23" />
build.gradle have code:
defaultConfig {
applicationId "cz.okhelp.words"
minSdkVersion 9
targetSdkVersion 19
versionCode 107
versionName "1.0.7"
}
Warning in AndroidManifest.xml:
This targetSdkVersion value (23) is not used; it is always overridden by the value specified in the Gradle build script (19) less... (Ctrl+F1)
The value of (for example) minSdkVersion is only used if it is not specified in the build.gradle build scripts. When specified in the Gradle build scripts, the manifest value is ignored and can be misleading, so should be removed to avoid ambiguity.
Import a new Android project for example downloaded from internet via Eclipse into project folder.
- Right click into projects explorer in Eclipse and select Import
- Android
- Existing Android Code Into Workspace
- Root Directory (select folder of downloaded project)
- Check your downloaded project
- Check Copy project into Workspace
- Finish (press)
putString(), putBoolean(), putInt() etc.¨
How we can start an activity programmatically.
How we can start an activity programmatically.
// MainActivity.java
// myButton.setOnClickListener
Intent binary = new Intent(getApplicationContext(),Calculate.class);
Bundle b = new Bundle();
b.putString("prvni_label", "Decimal");
b.putString("druhy_label", "Binary");
b.putString("mode", "binary_to_decimal");
binary.putExtras(b);
startActivityForResult(binary, 0);
// in Calculate.java onCreate
TextView mTextView1 = (TextView)findViewById(R.id.textView1);
TextView mTextView2 = (TextView)findViewById(R.id.textView2);
Bundle _bundle = getIntent().getExtras();
mTextView1.setText(_bundle.getString("prvni_label"));
mTextView2.setText(_bundle.getString("druhy_label"));
//.................. HOW OPEN START NEW ACTIVITY WITHOUT A PARAMETER .........................
startActivity(new Intent(ThisActivity.this, NewActivity.class));
Try two way in Eclipse IDE:
1.) Import the library project into your Eclipse workspace.
Click File > Import,
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
If project not visible with checkbox try next step as see below.
2.) Click
File > New > Other
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
1.) Import the library project into your Eclipse workspace.
Click File > Import,
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
If project not visible with checkbox try next step as see below.
2.) Click
File > New > Other
select Android > Existing Android Code into Workspace, and browse to the copy of the library project to import it.
Editace: 2011-10-08 15:38:52
Počet článků v kategorii: 396
Url:onsaveinstancestate-onrestoreinstancestate-basic-android-example