Question

我创建了一个简单的应用程序，允许用户在框中键入电话号码，然后按一个按钮，该按钮启动搜索联系人的活动并返回与输入的电话号码相匹配的联系人姓名。

但该应用程序会继续强行关闭。

这是代码

package com.xenom.text;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract.PhoneLookup;
import android.util.Log;
import android.view.View;

public class DriveAndTextActivity extends Activity 
{

private View button1;
private String Text1;


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


    button1.setOnClickListener(new View.OnClickListener() {
        private String TAG;

        public void onClick(View v) {
            Log.d(TAG, "mbutton1 clicked");
            Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(Text1));
            resolver.query(uri, new String[]{PhoneLookup.DISPLAY_NAME});

}
    });
}
}

新代码

package com.xenom.text;

import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.provider.ContactsContract.PhoneLookup;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class DriveAndTextActivity extends Activity 
{

private Button mbutton1;
private String mText1;

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

    // Obtain handles to UI objects
    mbutton1 = (Button) findViewById(R.id.button1);

    mbutton1.setOnClickListener(new View.OnClickListener() {
        private String TAG;

        public void onClick(View v) {
            Log.d(TAG, "mbutton1 clicked");
            Uri uri = Uri.withAppendedPath(PhoneLookup.CONTENT_FILTER_URI, Uri.encode(mText1));
            resolver.query(uri, new String[]{PhoneLookup.DISPLAY_NAME});

}
    });
}
}

logcat的：

[2011-07-27 22:43:56 - ddmlib]An established connection was aborted by the software in your host machine
java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(Unknown Source)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
    at sun.nio.ch.IOUtil.write(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
    at com.android.ddmlib.Client.sendAndConsume(Client.java:574)
    at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
    at com.android.ddmlib.Client.requestAllocationStatus(Client.java:420)
    at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
    at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
    at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
    at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
    at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
    at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

[2011-07-27 22:43:56 - ddmlib]An established connection was aborted by the software in your host machine
java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(Unknown Source)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
    at sun.nio.ch.IOUtil.write(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
    at com.android.ddmlib.Client.sendAndConsume(Client.java:574)
    at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
    at com.android.ddmlib.Client.requestAllocationStatus(Client.java:420)
    at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
    at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
    at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
    at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
    at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
    at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

[2011-07-27 22:43:56 - ddmlib]An established connection was aborted by the software in your host machine
java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(Unknown Source)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
    at sun.nio.ch.IOUtil.write(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
    at com.android.ddmlib.Client.sendAndConsume(Client.java:574)
    at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
    at com.android.ddmlib.Client.requestAllocationStatus(Client.java:420)
    at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
    at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
    at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
    at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
    at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
    at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

[2011-07-27 22:43:56 - ddmlib]An established connection was aborted by the software in your host machine
java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(Unknown Source)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
    at sun.nio.ch.IOUtil.write(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
    at com.android.ddmlib.Client.sendAndConsume(Client.java:574)
    at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
    at com.android.ddmlib.Client.requestAllocationStatus(Client.java:420)
    at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
    at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
    at com.android.ddmlib.DeviceMonitor.processIncomingJdwpData(DeviceMonitor.java:781)
    at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:649)
    at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
    at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

[2011-07-27 22:43:57 - ddmlib]An established connection was aborted by the software in your host machine
java.io.IOException: An established connection was aborted by the software in your host machine
    at sun.nio.ch.SocketDispatcher.write0(Native Method)
    at sun.nio.ch.SocketDispatcher.write(Unknown Source)
    at sun.nio.ch.IOUtil.writeFromNativeBuffer(Unknown Source)
    at sun.nio.ch.IOUtil.write(Unknown Source)
    at sun.nio.ch.SocketChannelImpl.write(Unknown Source)
    at com.android.ddmlib.JdwpPacket.writeAndConsume(JdwpPacket.java:213)
    at com.android.ddmlib.Client.sendAndConsume(Client.java:574)
    at com.android.ddmlib.HandleHeap.sendREAQ(HandleHeap.java:348)
    at com.android.ddmlib.Client.requestAllocationStatus(Client.java:420)
    at com.android.ddmlib.DeviceMonitor.createClient(DeviceMonitor.java:854)
    at com.android.ddmlib.DeviceMonitor.openClient(DeviceMonitor.java:822)
    at com.android.ddmlib.DeviceMonitor.deviceClientMonitorLoop(DeviceMonitor.java:618)
    at com.android.ddmlib.DeviceMonitor.access$100(DeviceMonitor.java:42)
    at com.android.ddmlib.DeviceMonitor$3.run(DeviceMonitor.java:577)

Answer 1

您在哪里实例化button1实例？你需要像

这样的东西

button1 = (Button)findViewById(R.id.myButton);

日志说什么？当您尝试在空变量引用上设置on click侦听器时，我猜您在行上有NullPointerException。

Answer 2

您必须初始化按钮。首先，将全局变量button1更改为类型Button。然后，在setContentView（R.layout.main）之后，调用它：

button1 = (Button)findViewById(R.id.button);

<强>更新

错误也可能是因为即使mText1为空，您也尝试Uri.encode(mText1)。

应用程序保持强制关闭

2 个答案: