Question

我有一个可以从其他活动中调用的NetworkErrorActivity。

我已经编写了下面的代码来查找我上次调用的活动。它将它存储在String调用者中。

除此之外，我不确定如何继续。

我尝试过这样的事情：

        callerClass = Class.forName(caller);

但它在Class的第一行中引发了一个错误 - ＆＃34; Class是原始类型。对泛型类的引用应该参数化＆＃34;

以下是代码。

import android.support.v7.app.ActionBarActivity;
import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Toast;

public class NetworkErrorActivity extends ActionBarActivity {

Class callerClass;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_network_error);

    String caller = getIntent().getStringExtra("caller");
    try {
        callerClass = Class.forName(caller);
    } catch (ClassNotFoundException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       
}

/** Called when the user clicks the Retry button */
public void retryURL(View v) {

    if(isNetworkStatusAvailable (getApplicationContext())) {

        Intent intent = new Intent(this, callerClass);
        this.startActivity(intent);
        finish();

    } else {

        Toast.makeText(getApplicationContext(), "Internet Connection Unavailable.", Toast.LENGTH_SHORT).show();

     }

}   

public static boolean isNetworkStatusAvailable (Context context) {
    ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (connectivityManager != null) 
    {
        NetworkInfo netInfos = connectivityManager.getActiveNetworkInfo();
        if(netInfos != null)
        if(netInfos.isConnected()) 
            return true;
    }
    return false;
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    getMenuInflater().inflate(R.menu.network_error, menu);
    return true;
}

/*
@Override
public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();
    if (id == R.id.action_settings) {
        return true;
    }
    return super.onOptionsItemSelected(item);
}
*/

@Override
public void onBackPressed()
{
    finish();
   // super.onBackPressed(); // Comment this super call to avoid calling finish()
}



}

如何使用被称为类的最后一个活动？

0 个答案: