不知道还有什么要添加的。当我按下应该打开一个新屏幕的按钮时,没有任何反应。
此外,EditText在返回MainActivity屏幕后没有保存任何输入。
代码顺序: 主要活动 NewScreenActivity 的Manifest.xml (不包括每个活动的xml,但如果必要的话可以包括)
两个活动都在同一个包中。
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText userText;
Button buttonToNewScreen;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
userText = (EditText) findViewById(R.id.userText);
buttonToNewScreen = (Button) findViewById(R.id.buttonToNewScreen);
userText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String input = userText.getText().toString();
Intent toNewScreen = new Intent(MainActivity.this, NewScreenActivity.class);
toNewScreen.putExtra("input", input);
startActivity(toNewScreen);
}
});
}
}
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.EditText;
public class NewScreenActivity extends AppCompatActivity {
String userInput;
EditText output;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_new_screen);
Intent thisIntent = getIntent();
userInput = thisIntent.getStringExtra("input");
output = (EditText) findViewById(R.id.output);
output.setText(userInput);
}
}
(由Android Studio生成)
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.intri.firstexample">
<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>
<activity android:name=".NewScreenActivity"></activity>
</application>
</manifest>
感谢任何可以提供帮助的人
答案 0 :(得分:1)
buttonToNewScreen = (Button) findViewById(R.id.buttonToNewScreen);
userText.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String input = userText.getText().toString();
Intent toNewScreen = new Intent(MainActivity.this, NewScreenActivity.class);
toNewScreen.putExtra("input", input);
startActivity(toNewScreen);
}
});
而不是userText
(EditText
)将onClickListener设置为buttonToNewScreen
。