我想开发一个简单的Android应用程序，它有文本视图和几个按钮。我已经在我的应用程序2 whatsapp和2 facebook上放了4个按钮。我希望每当有人点击whatsapp按钮时，文本视图中的文本被转发用户希望发送消息的whatsapp上的联系人。同样我希望该用户能够将fb中的私人消息发送给他的朋友。该消息与textview中的文本相同。我的MainActivity.java文件位于
package com.example.shalabh.gratbites;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
public TextView textView;
public TextView textView2;
public Button button;
public Button button2;
public Button button3;
public Button button4;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onClickListenerButton2()
{
textView=(TextView)findViewById(R.id.textView);
button2=(Button)findViewById(R.id.button2);
button2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String fb = textView.getText().toString();
Intent shareIntent = new Intent();
shareIntent.setAction(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, fb);
startActivity(Intent.createChooser(shareIntent,"Share gratitude"));
}
});
}
public void onClickListenerButton3()
{
textView2 = (TextView)findViewById(R.id.textView2);
button3= (Button)findViewById(R.id.button3);
button3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String whatsAppMessage = textView2.getText().toString();
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, whatsAppMessage);
sendIntent.setType("text/plain");
// Do not forget to add this to open whatsApp App specifically
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
}
});
}
public void onClickListenerButton()
{
textView= (TextView)findViewById(R.id.textView);
button= (Button)findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String whatsAppMessage = textView.getText().toString();
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, whatsAppMessage);
sendIntent.setType("text/plain");
// Do not forget to add this to open whatsApp App specifically
sendIntent.setPackage("com.whatsapp");
startActivity(sendIntent);
}
});
}
}
我的main_activity.xml文件是
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity"
android:background="#ffffff">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="At times our own light goes out and is rekindled by a spark from another person. Each of us has cause to think with deep gratitude of those who have lighted the flame within us. "
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_marginTop="38dp"
android:editable="false"
android:elegantTextHeight="false"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Whatsapp"
android:id="@+id/button"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="40dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/button2"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_alignRight="@id/button"
android:layout_alignTop="@+id/button"
android:text="Facebook" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="I wanted to say thanks... and share my gratitude for everything I've been blessed with. Family, friends, and continued support from everyone."
android:id="@+id/textView2"
android:layout_below="@+id/button"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="74dp"
android:layout_alignRight="@+id/button2"
android:layout_alignEnd="@+id/button2" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="whatsapp"
android:id="@+id/button3"
android:layout_below="@+id/textView2"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="40dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Facebook"
android:id="@+id/button4"
android:layout_alignTop="@+id/button3"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
问题在于所有按钮都没有响应。我无法理解原因。如果可能的话，建议您采用替代方法，帮我找到问题的解决方案。
P.S。我还没有为button4编码
答案 0 :(得分：0)
您尚未调用已创建的方法。因此未设置 onClickListeners 。所以只需在onCreate中调用此方法就可以了，你就可以了。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
onClickListenerButton2();
onClickListenerButton3();
onClickListenerButton();
}