各位朋友， 我是一个android初学者，我的目的很简单 就是试试能不能在界面上拖一个Button控件，然后运行的时候给button设置文本为123。
但是我怎么调试都错误。总是提示source not found。请问是什么意思。
我首先建了个android项目，然后再oncreate方法加了红色的那两句代码，然后运行 就出现了错误。
[2014-07-03 12:01:24 - appcompat_v7] WARNING: unable to write jarlist cache file C:\Users\Administrator\workspace\appcompat_v7\bin\jarlist.cache
[2014-07-03 12:01:24 - appcompat_v7] WARNING: unable to write jarlist cache file C:\Users\Administrator\workspace\appcompat_v7\bin\jarlist.cache
[2014-07-03 12:04:39 - test] ------------------------------
[2014-07-03 12:04:39 - test] Android Launch!
[2014-07-03 12:04:39 - test] adb is running normally.
[2014-07-03 12:04:39 - test] Performing com.example.test.MainActivity activity launch
[2014-07-03 12:04:39 - test] Automatic Target Mode: launching new emulator with compatible AVD 'test'
[2014-07-03 12:04:39 - test] Launching a new emulator with Virtual Device 'test'
[2014-07-03 12:04:48 - test] New emulator found: emulator-5554
[2014-07-03 12:04:48 - test] Waiting for HOME ('android.process.acore') to be launched...
[2014-07-03 12:05:35 - test] HOME is up on device 'emulator-5554'
[2014-07-03 12:05:35 - test] Uploading test.apk onto device 'emulator-5554'
[2014-07-03 12:05:35 - test] Installing test.apk...
[2014-07-03 12:06:10 - test] Success!
[2014-07-03 12:06:10 - test] Starting activity com.example.test.MainActivity on device emulator-5554
[2014-07-03 12:06:13 - test] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.test/.MainActivity }
[2014-07-03 12:06:16 - test] Attempting to connect debugger to 'com.example.test' on port 8615
[2014-07-03 12:07:27 - test] Dx
trouble writing output: already prepared
[2014-07-03 12:07:28 - test] ------------------------------
[2014-07-03 12:07:28 - test] Android Launch!
[2014-07-03 12:07:28 - test] adb is running normally.
[2014-07-03 12:07:28 - test] Performing com.example.test.MainActivity activity launch
[2014-07-03 12:07:28 - test] Automatic Target Mode: using existing emulator 'emulator-5554' running compatible AVD 'test'
[2014-07-03 12:07:28 - test] Uploading test.apk onto device 'emulator-5554'
[2014-07-03 12:07:28 - test] Installing test.apk...
[2014-07-03 12:07:39 - test] Success!
[2014-07-03 12:07:39 - test] Starting activity com.example.test.MainActivity on device emulator-5554
[2014-07-03 12:07:41 - test] ActivityManager: Starting: Intent { act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] cmp=com.example.test/.MainActivity }
[2014-07-03 12:07:41 - test] Attempting to connect debugger to 'com.example.test' on port 8623
这是调试时候输出的日志
模拟器中显示
请问大家 这是为什么
------解决方案--------------------
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
以上代码用下面的代码替换掉
setContentView(R.layout.fragment_main);
------解决方案--------------------
LZ你好，我也是初学者，你用的是最新的SDK吗？
1楼是直接把布局设置为fragment_main.xml，
或者你也可以把
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}注掉，然后把按钮放在activity_main.xml里面，这样就和旧版本的写法一样了。