如何通过单击在新布局中显示 Android ListView 项目

Question

我正在开发应用程序，我想在列表视图中显示一些引语和谚语，并且还想在用户单击列表时在新布局文件中显示每个引语 item.This 我的主要代码 Activity 使用简单的列表视图：-

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;

/**
 * Created by Tauseef on 11/11/2015.
 */
public class MainActivity extends AppCompatActivity {

    private String[] loveArray = { 
            "Jo Pyar Hamesha Sath Rahe Wo Sacha Hai Ji,\n" +
            "Jo Musibaton Mein Kaam Aaye Wo Acha Hai Ji,\n" +
            "Kabhi Kabhi Humse Bhi Ho Jati Hai Nadaniya,\n" +
            "Kyonki Dil To Baccha Hai Ji.", "Chor to sakta hu,\n" +
            "Magar Chor nahipate use,\n" +
            "Wo shaks meri bigri huyi,\n" +
            "Aadat ki trha hai.", 

            "Ek shaam aati hai tumhari yaad lekar,\n" +
            "Ek shaam jaati hai tumhari yaad dekar,\n" +
            "Par hume intezaar hai us shaam ka,\n" +
            "Jo aaye sirf tumhe saath lekar" 
};

    private ListView loveListView;
    private ArrayAdapter arrayAdapter;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_love);

        Intent intent = getIntent();

        loveListView = (ListView) findViewById(R.id.loveList);

        // this-The current activity context.
        // Second param is the resource Id for list layout row item
        // Third param is input array
        arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, loveArray);
        loveListView.setAdapter(arrayAdapter);

        loveListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                      

                Intent newIntent = new Intent(LoveActivity.this, MainContent.class);
                newIntent.putExtra("loveArray", position);
                startActivity(newIntent);
            }
        });
    }
}

这里是新的 activity 只有文本视图，我想在其中将单击的列表项显示为文本视图:-

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

/**
 * Created by Tauseef on 11/11/2015.
 */
public class MainContent extends AppCompatActivity {

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

        TextView textView =(TextView)findViewById(R.id.mainContentTextView);
        Intent intent = getIntent();
        String data = "";
        if(intent!= null){
            Bundle extras = intent.getExtras();
            if(extras != null){
                data = extras.getString("loveArray");
            }
        }
            }
}

每次当我运行这个应用程序并点击列表项时，它会显示空指针异常和其他一些东西。我没有得到这段代码中实际出现的错误类型。

Answer 1

Bundle extras = intent.getExtras();
            if(extras != null){
                data = extras.getInt("loveArray");
            }

并使用 getInt("loveArray") 而不是 getString()

Bçoz 你超过了位置，即 int

Intent newIntent = new Intent(LoveActivity.this, MainContent.class);
newIntent.putExtra("loveArray", position);//Int not string

编辑： 如果您传递报价消息而不是位置，请使用下面的内容。

Intent newIntent = new Intent(LoveActivity.this, MainContent.class);
newIntent.putExtra("loveArray", loveArray [position]);// Pass the quote as string

然后

data = extras.getString("loveArray");会起作用

Answer 2

问题出在您的 MainActivity activity 您传递了一个整数（位置）值，而您从 MainContent activity 收到了一个字符串值。你需要写

data = extras.getInt("loveArray");

的墨水瓶

data = extras.getString("loveArray");

Answer 3

您的 loveArray 应该有不止一项。因此，当您通过单击列表视图启动 activity 时，它应该占据位置数组，因此更改

newIntent.putExtra("loveArray", position);

至

newIntent.putExtra("loveArray", loveArray[position]);

所以它需要特定位置数组的数据

Answer 4

按照以下步骤操作

不是只传递位置，而是通过

传递字符串

Intent intent = new Intent(LoveActivity.this, MainContent.class);
intent.putExtra("loveArray", loveArray[position]);// this will pass the string of this position`

然后在 MainContent Activity 中，执行

data= extras.getString("loveArray"); 它必须有效`

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