你好,我正在尝试使用隐式意图来启动第二个活动。TextView和Button在Activity One中起作用,但是当我点击按钮启动第二个活动时,在第二个活动中看不到任何TextView。我只得到一个黑色的空白屏幕。如果我按返回键,它会带我回到Activity One。
我也只是按照这个链接做了一个测试: http://mubasheralam.com/tutorials/android/how-start-another-activity
结果同样发生了。我可以看到Activity One,但Activity Two只是一个空白屏幕。
这是我的代码:
ActivityOne.java:
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
import android.content.Context;
import android.content.Intent;
import android.widget.Button;
import android.view.View.OnClickListener;
import android.view.View;
import android.widget.LinearLayout;
public class ActivityOne extends Activity implements OnClickListener {
private TextView mytext;
private Button mybutton;
private LinearLayout linearlayout;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
linearlayout = new LinearLayout(this);
mytext = new TextView(this);
mybutton = new Button(this);
mybutton.setText("Next Activity");
mybutton.setOnClickListener(this);
mytext.setText("Activity1");
linearlayout.addView(mytext);
linearlayout.addView(mybutton);
setContentView(linearlayout);
}
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction("com.example.hello.SHOW");
intent.putExtra("com.example.hello.Implicit_intent", "This is extras");
startActivity(intent);
}
}
ActivityTwo.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;
public class ActivityTwo extends Activity {
private TextView mytext;
private LinearLayout linearlayout;
public void OnCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mytext = new TextView(this);
linearlayout = new LinearLayout(this);
linearlayout.addView(mytext);
Bundle extras = getIntent().getExtras();
mytext.setText("Activity One value: " + extras.getString("com.example.hello.Implicit_intent"));
setContentView(linearlayout);
}
}
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.hello"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".ActivityOne"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".ActivityTwo"
android:label="@string/app_name">
<intent-filter>
<action android:name="com.example.hello.SHOW" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
我正在使用 Android 模拟器 2.3.3,CPU/ABI 是 ARM。