Androidアプリ:画面遷移時に値を渡す
Androidで画面遷移時に値を渡す方法です。
数値を渡す場合
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(getApplication(),QuestionActivity.class);
intent.putExtra("question",1);
startActivity(intent);
}
});
}
}
activity_main.xml
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ボタン"
android:textSize="30sp"
/>
SubActivity.java
public class SubActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub);
TextView text = (TextView)findViewById(R.id.text);
Intent intent = getIntent();
Integer data = intent.getIntExtra("question",0);
text.setText(String.valueOf(data));
Button backButton = findViewById(R.id.back);
backButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
finish();
}
});
}
}
activity_sub.xml
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="30dp"/>
<Button
android:id="@+id/back"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="back"
/>
文字列を渡す場合
MainActivity.java
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
Intent intent = new Intent(getApplication(),QuestionActivity.class);
intent.putExtra("question","文字列");
startActivity(intent);
}
});
}
}
activity_main.xml
<Button
android:id="@+id/button"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ボタン"
android:textSize="30sp"
/>
SubActivity.java
public class SubActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub);
TextView text = (TextView)findViewById(R.id.text);
Intent intent = getIntent();
String data = intent.getStringExtra("question");
text.setText(data);
Button backButton = findViewById(R.id.back);
backButton.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v){
finish();
}
});
}
}
activity_sub.xml
<TextView
android:id="@+id/text"
android:layout_width="match_parent"
android:layout_height="30dp"/>
<Button
android:id="@+id/back"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="back"
/>
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