java 错误：“无法从类型 Activity 对非静态方法 startActivity(Intent) 进行静态引用”

Error: "Cannot make a static reference to the non-static method startActivity(Intent) from the type Activity"

提问by shripal

private int pos = position;
                    @Override
                    public void onClick(View v) {
                        Toast.makeText(context, "Click-" + String.valueOf(pos), Toast.LENGTH_SHORT).show(); 
                        iBean = (InboxBean)result.get(position);
                        ConstantData.inbox_subject = iBean.subject;
                        ConstantData.inbox_body = iBean.body;
                        ConstantData.inbox_postDate = iBean.postdate;

                        startActivity(new Intent(InboxActivity.this,InboxDetailActivity.class));//getting error at startActivity 
                    }
            });

I am getting the following error at startActivity line: "Cannot make a static reference to the non-static method startActivity(Intent) from the type Activity"

我在 startActivity 行收到以下错误： "Cannot make a static reference to the non-static method startActivity(Intent) from the type Activity"

Please help.

请帮忙。

回答by Vladimir Ivanov

I assume you have this in the inner static class of your activity. Don't do that. OnClickListeners should exist in the context of the particular instance of activity.

我假设您在活动的内部静态类中有这个。不要那样做。OnClickListeners 应该存在于特定活动实例的上下文中。

回答by Jaldip Katre

To make static reference to non static methods, you need to call them by using the context of the activity or application.

要对非静态方法进行静态引用，您需要使用活动或应用程序的上下文来调用它们。

This is also true when you need to call activity from non activity class.

当您需要从非活动类调用活动时也是如此。

The following type of code can be used

可以使用以下类型的代码

Intent cc=new Intent(yourcontext,Yourpackagename.ClassName.class);
yourcontext.startActivity(cc);

回答by Imran

Plz Try this sample its has one main activity i.e. ListActivity and on click an item sub Activity i.e Activity shows its detail

请试试这个示例，它有一个主要活动，即 ListActivity，点击一个项目子活动，即活动显示其详细信息

Main Activity Class "listActivity" is as

主要活动类“listActivity”是

package edu.android.clickablelist;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.app.ListActivity;
import android.content.Intent;

public class listActivity extends ListActivity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Create an array of Strings, that will be put to our ListActivity
        String[] names = new String[] {"Linux", "Windows7", "Eclipse", "Suse", "Ubuntu", "Solaris", "Android", "iPhone"};
        // Create an ArrayAdapter, that will actually make the Strings above
        // appear in the ListView
        this.setListAdapter(new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_checked, names));

    }
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
        super.onListItemClick(l, v, position, id);
        // Get the item that was clicked
        Object o = this.getListAdapter().getItem(position);

        final String keyword = o.toString();

        Bundle b = new Bundle();
        b.putString("Test", keyword );
        Intent i = new Intent(listActivity.this,
                DetailsActivity.class);
        i.putExtras(b);
        startActivityForResult(i,0);
    }




}

and SubActivity is As

和子活动是

package edu.android.clickablelist;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.view.*;

public class DetailsActivity extends Activity
{
    TextView tv;

    private static final int SUB_ACTIVITY_REQUEST_CODE = 0;
    @Override
    public void onCreate(Bundle Savedinstances)
       {
          super.onCreate(Savedinstances);
          setContentView(R.layout.details);
          //for getting parameters passed from listActivity.java

          Bundle b = this.getIntent().getExtras();
          String selItem = b.getString("Test");
          //how to set text of selected item?

          tv = (TextView) findViewById(R.id.SelectedItem);
            tv.setText("You are viewing Details of " + selItem);
          Button btn = (Button) findViewById(R.id.btnClick2);
          btn.setOnClickListener(new View.OnClickListener() {
             public void onClick(View arg0) {
             setResult(RESULT_OK);
             finish();
             } 
          });
       }
    //this is important to get result of StartActivityForResult
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == SUB_ACTIVITY_REQUEST_CODE){
                Bundle b = data.getExtras();
                tv.setText(b.getString("Test"));
        }
    }




}

You also need to add reference of sub activity in "AndroidManifest.xml"

您还需要在“AndroidManifest.xml”中添加子活动的引用

For Above codes Sample XML is

对于上述代码示例 XML 是

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="edu.android.clickablelist"
      android:versionCode="1"
      android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".listActivity"
                  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=".DetailsActivity"
                  class=".DetailsActivity" 
                  android:label="DetailsActivity">
      </activity>
    </application>
</manifest> 

Hopefully this will helps

希望这会有所帮助