Question

我正在尝试通过新意图将所选项目发送到另一个活动。但是当我点击项目时，显示application has been stopped working消息并终止应用程序。这是我的第一个活动代码

public class AndroidListViewActivity extends ListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // storing string resources into Array
        String[] adobe_products = getResources().getStringArray(R.array.adobe_products);

        // Binding resources Array to ListAdapter

        this.setListAdapter(new ArrayAdapter<String>(AndroidListViewActivity.this, R.layout.list_item, R.id.label, adobe_products));

        ListView lv =getListView();
        lv.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int pos,
                    long id) {
                // TODO Auto-generated method stub
                String product = ((TextView) view).getText().toString();


                Intent curentScreen = new Intent(getApplicationContext(), SingleItem.class);
                curentScreen.putExtra("product", product);

                startActivity(curentScreen);
            }
        });         

    }  

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.android_list_view, menu);
        return true;
    }

}

第二个活动代码。

public class SingleItem extends Activity{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.single_list_item_view);
        TextView txtProduct = (TextView) findViewById(R.id.product_label);

        Intent i = getIntent();
        // getting attached intent data
        String product = i.getStringExtra("product");
        // displaying selected product name
        txtProduct.setText(product);

    }
}

stacktrace：

08-13 14:05:35.678: D/AndroidRuntime(267): Shutting down VM
08-13 14:05:35.698: W/dalvikvm(267): threadid=1: thread exiting with uncaught exception (group=0x4001d800) 
08-13 14:05:35.728: E/AndroidRuntime(267): FATAL EXCEPTION: main 
08-13 14:05:35.728: E/AndroidRuntime(267): java.lang.ClassCastException: java.lang.String 
08-13 14:05:35.728: E/AndroidRuntime(267): at com.list.androidlistviewactivity.AndroidListViewActivity$1.onItemClick(AndroidLi‌stViewActivity.java:39)     
08-13 14:05:35.728: E/AndroidRuntime(267): at android.widget.AdapterView.performItemClick(AdapterView.java:284)
08-13 14:05:35.728: E/AndroidRuntime(267): at android.widget.ListView.performItemClick(ListView.java:3382)
08-13 14:05:35.728: E/AndroidRuntime(267): at android.widget.AbsListView$PerformClick.run(AbsListView.java:1696) 
08-13 14:05:35.728: E/AndroidRuntime(267): at android.os.Handler.handleCallback(Handler.java:587) 
08-13 14:05:35.728: E/AndroidRuntime(267): at android.os.Handler.dispatchMessage(Handler.java:92) 
08-13 14:05:35.728: E/AndroidRuntime(267): at android.os.Looper.loop(Looper.java:123) 
08-13 14:05:35.728: E/AndroidRuntime(267): at android.app.ActivityThread.main(ActivityThread.java:4627) 
08-13 14:05:35.728: E/AndroidRuntime(267): at java.lang.reflect.Method.invokeNative(Native Method)
08-13 14:05:35.728: E/AndroidRuntime(267): at java.lang.reflect.Method.invoke(Method.java:521)      
08-13 14:05:35.728: E/AndroidRuntime(267): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
08-13 14:05:35.728: E/AndroidRuntime(267): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
08-13 14:05:35.728: E/AndroidRuntime(267): at dalvik.system.NativeStart.main(Native Method)

Answer 1

替换此

   String product = ((TextView) view).getText().toString();

与

TextView tv = (TextView)view.findViewById(R.id.label);  //initialize text view withid label
String product = tv.getText().toString(); //get the text

或者

String product = (String)parent.getItemAtPosition(pos);
Toast.makeText(getApplicationContext(), product,Toast.LENGTH_SHORT).show();

然后

            Intent curentScreen = new Intent(ActivityName.this, SingleItem.class);
            curentScreen.putExtra("product", product);
            startActivity(curentScreen);

示例：此处单击列表行时，您将看到吐司。

LIST_ITEM

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/label" // textview with id label
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp"
        android:text="TextView" />

</RelativeLayout>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources> 
    <string-array name="planets_array">
        <item>Mercury</item>
        <item>Venus</item>
        <item>Earth</item>
        <item>Mars</item>
    </string-array>

</resources>

MainActivity

public class MainActivity extends ListActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String[] planets = getResources().getStringArray(R.array.planets_array);
        this.setListAdapter(new ArrayAdapter<String>(MainActivity.this, R.layout.list_item, R.id.label, planets));
        ListView lv =getListView();
        lv.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int pos,
                    long id) {
                // TODO Auto-generated method stub
                TextView tv = (TextView)view.findViewById(R.id.label); 
                String product = tv.getText().toString();
                Toast.makeText(getApplicationContext(), product,Toast.LENGTH_SHORT).show();
            }
        });         

    }  
}

快照

enter image description here

Answer 2

你开始第二次活动的方式不对。

替换您创建意图的行

Intent curentScreen = new Intent(getApplicationContext(), SingleItem.class);

与

Intent intent = new Intent(AndroidListViewActivity.this, SingleItem.class);

作为Intent构造函数中的第一个参数，您必须传递源Activity，即this。由于您在OnItemClickListener中调用该函数，因此使用AndroidListViewActivity.this调用它。希望这能解决错误。

Answer 3

相反，您可以获得字符串product，如下所示：

替换onItemClick

中的以下行

String product = ((TextView) view).getText().toString();

与

TextView tv = (TextView)view.findViewById(R.id.textview1); 
String product = tv.getText().toString();

通过intent传递listView数据

3 个答案: