如何使用按钮从一个活动切换到另一个活动？
我正在尝试使用按钮(使用下面提到的意图代码)从一个活动移动到另一个活动。问题是，我做不到。
MainActivity.Java：
package com.webding.gateway14;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.content.Intent;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onClick(View v)
{
// TODO Auto-generated method stub
Intent i = new Intent(getApplicationContext(),GoogleDocsLogin.class);
startActivity(i);
setContentView(R.layout.activity_login);
}
}; ;
Manifest.xml：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.webding.gateway14"
android:installLocation="auto"
android:versionCode="1"
android:versionName="1.0.24" >
<uses-sdk
android:minSdkVersion="10"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".GoogleDocsLogin"
android:label="@string/title_activity_google_docs_login" >
</activity>
</application>
</manifest>
GoogleDocsLogin.java(第二个练习)：
package com.webding.gateway14;
import java.net.URL;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.net.Uri;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.webkit.WebView;
import android.content.Intent;
public class GoogleDocsLogin extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.google_docs_login, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);}
public boolean shouldOverrideUrlLoading(WebView view, String url) {
try {
URL urlObj = new URL(url);
// The popular Google forms URL shortener has
// been modified here to get Stack Overflow to
// accept it
if( TextUtils.equals(urlObj.getHost(),"http://boo.gl/forms/VftZnVjaCr") ) {
//Allow the WebView in your application to do its thing
return false;
} else {
//Pass it to the system, doesn't match your domain
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setData(Uri.parse(url));
startActivity(intent);
//Tell the WebView you took care of it.
return true;
}
}
catch (Exception e) {
e.printStackTrace();
}
return false;
}
}
active_main.xml：
<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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.webding.gateway14.MainActivity" >
<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="52dp"
android:text="@string/next" />
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="8dp"
android:text="@string/copyright"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView5"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView6"
android:layout_marginTop="26dp"
android:text="@string/mfs"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignRight="@+id/textView1"
android:layout_marginRight="52dp"
android:layout_marginTop="51dp"
android:text="@string/gway"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:id="@+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/button1"
android:layout_below="@+id/textView2"
android:layout_marginTop="25dp"
android:text="@string/presented"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView6"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView2"
android:layout_below="@+id/textView4"
android:layout_marginTop="28dp"
android:text="@string/cclub"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/textView2"
android:layout_below="@+id/textView3"
android:layout_marginTop="89dp"
android:text="@string/cc"
android:textAppearance="?android:attr/textAppearanceLarge" />
</RelativeLayout>
解决方案
将其放入它将执行的onCreate方法
Button button1 = (Button) findViewById(R.id.button1);
button1.setOnClickListener(new OnClickListener(){
public void onClick(View arg0)
{ Intent i = new Intent(getApplicationContext(),GoogleDocsLogin.class);
startActivity(i);
} };
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