我一直在嘗試創建一個應用程序,該應用程序將圖像發送給另一個人,只有一個圖像。如果用戶想要手動輸入答案,應用程序的其中一個佈局具有文本字段,還有兩個按鈕:一個用於在聯繫人中搜索,以便用戶可以選擇聯繫人,另一個用於發送消息。發送按鈕應該確保在嘗試發送之前在文本字段中有輸入。我找到了一種發送文本的方式,比我找到的其他方式更簡單。我是Android開發新手。我在下面使用的方式是通過意圖。它還沒有添加圖片部分,因爲我想確保它首先工作,所以它只是發送你好世界。它似乎沒有在程序中的任何錯誤,但是當我按下發送按鈕時,出現一個錯誤,說應用程序不得不停止。你們知道我應該怎麼做才能解決這個問題嗎?我已經清理了幾次。感謝您的幫助。通過意圖發送短信導致應用程序停止
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.EditText;
public class Send extends Activity implements OnClickListener {
EditText phoneNo = null;
String phoneNoString;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.send);
// Set up click listener for all buttons
View sendSmsButton = findViewById(R.id.send_sms_button);
sendSmsButton.setOnClickListener(this);
View contactsButton = findViewById(R.id.contacts);
contactsButton.setOnClickListener(this);
// TODO Auto-generated method stub
}
public void onClick(View v) {
switch (v.getId()) {
case R.id.send_sms_button:
phoneNoString = phoneNo.getEditableText().toString().trim();
invokesSMSApp();
}
}
public void invokesSMSApp() {
Intent smsIntent = new Intent(Intent.ACTION_VIEW);
smsIntent.putExtra("sms_body", "Hello World!");
smsIntent.putExtra("address", phoneNoString);
smsIntent.setType("vnd.android-dir/mms-sms");
startActivity(smsIntent);
}
}
這是我收到的錯誤:
07-15 00:56:09.213: E/AndroidRuntime(1098): FATAL EXCEPTION: main
07-15 00:56:09.213: E/AndroidRuntime(1098): java.lang.NullPointerException
07-15 00:56:09.213: E/AndroidRuntime(1098): at com.example.getaroundtoit.Send.onClick(Send.java:31)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.view.View.performClick(View.java:4204)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.view.View$PerformClick.run(View.java:17355)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.os.Handler.handleCallback(Handler.java:725)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.os.Handler.dispatchMessage(Handler.java:92)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.os.Looper.loop(Looper.java:137)
07-15 00:56:09.213: E/AndroidRuntime(1098): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-15 00:56:09.213: E/AndroidRuntime(1098): at java.lang.reflect.Method.invokeNative(Native Method)
07-15 00:56:09.213: E/AndroidRuntime(1098): at java.lang.reflect.Method.invoke(Method.java:511)
07-15 00:56:09.213: E/AndroidRuntime(1098): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-15 00:56:09.213: E/AndroidRuntime(1098): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-15 00:56:09.213: E/AndroidRuntime(1098): at dalvik.system.NativeStart.main(Native Method)
07-15 00:56:16.835: E/Trace(1131): error opening trace file: No such file or directory (2)
07-15 00:59:44.342: E/AndroidRuntime(1131): FATAL EXCEPTION: main
07-15 00:59:44.342: E/AndroidRuntime(1131): java.lang.NullPointerException
07-15 00:59:44.342: E/AndroidRuntime(1131): at com.example.getaroundtoit.Send.onClick(Send.java:31)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.view.View.performClick(View.java:4204)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.view.View$PerformClick.run(View.java:17355)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.os.Handler.handleCallback(Handler.java:725)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.os.Handler.dispatchMessage(Handler.java:92)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.os.Looper.loop(Looper.java:137)
07-15 00:59:44.342: E/AndroidRuntime(1131): at android.app.ActivityThread.main(ActivityThread.java:5041)
07-15 00:59:44.342: E/AndroidRuntime(1131): at java.lang.reflect.Method.invokeNative(Native Method)
07-15 00:59:44.342: E/AndroidRuntime(1131): at java.lang.reflect.Method.invoke(Method.java:511)
07-15 00:59:44.342: E/AndroidRuntime(1131): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-15 00:59:44.342: E/AndroidRuntime(1131): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-15 00:59:44.342: E/AndroidRuntime(1131): at dalvik.system.NativeStart.main(Native Method)
模擬器給出了模擬器的屏幕,上面寫着應用程序不得不停止錯誤消息。
你得到什麼錯誤? – nedaRM