最开始提到了Launcher选择弹窗，我们就考虑在这里做点事，把弹窗的逻辑给跳过，就可以实现默认启动。
弹窗源码位于frameworks/base/core/java/com/android/internal/app/ResolverActivity.java
在这里就不具体分析源码了，就看关键部分
public boolean configureContentView(List payloadIntents, Intent[] initialIntents,
List rList, boolean alwaysUseOption) {
// The last argument of createAdapter is whether to do special handling
// of the last used choice to highlight it in the list. We need to always
// turn this off when running under voice interaction, since it results in
// a more complicated UI that the current voice interaction flow is not able
// to handle.
mAdapter = createAdapter(this, payloadIntents, initialIntents, rList,
mLaunchedFromUid, alwaysUseOption && !isVoiceInteraction());
final int layoutId;
if (mAdapter.hasFilteredItem()) {
layoutId = R.layout.resolver_list_with_default;
alwaysUseOption = false;
} else {
layoutId = getLayoutResource();
}
mAlwaysUseOption = alwaysUseOption;
int count = mAdapter.getUnfilteredCount();
if (count == 1 && mAdapter.getOtherProfile() == null) {
// only one target, so we’re a candidate to auto-launch!
final TargetInfo target = mAdapter.targetInfoForPosition(0, false);
if (shouldAutoLaunchSingleChoice(target)) {
safelyStartActivity(target);
mPackageMonitor.unregister();
mRegistered = false;
finish();
return true;
}
}
if (count > 0) {
// add by liuwei,if set my_default_launcher,start default
String defaultlauncher = Settings.Global.getString(this.getContentResolver(), “my_default_launcher”);
final TargetInfo defaultTarget = mAdapter.targetInfoForDefault(defaultlauncher);
if(defaultTarget != null){
safelyStartActivity(defaultTarget);
mPackageMonitor.unregister();
mRegistered = false;
finish();
return true;
}
//end
setContentView(layoutId);
mAdapterView = (AbsListView) findViewById(R.id.resolver_list);
onPrepareAdapterView(mAdapterView, mAdapter, alwaysUseOption);
} else {
setContentView(R.layout.resolver_list);
final TextView empty = (TextView) findViewById(R.id.empty);
empty.setVisibility(View.VISIBLE);
mAdapterView = (AbsListView) findViewById(R.id.resolver_list);
mAdapterView.setVisibility(View.GONE);
}
return false;
}
在configureContentView中判断launcher应用个数，如果为1，则直接启动，finish当前页面。下面判断count>0，我们就在这里面增加自己的逻辑，获取配置的Settings.Global参数，再去Adapter中判断是否有应用包名和参数匹配，如果有就safelyStartActivity()，关闭弹窗。如果没有匹配包名，就走正常流程，弹窗提示用户。
mAdapter.targetInfoForDefault函数是在 public class ResolveListAdapter extends baseAdapter中增加函数
public TargetInfo targetInfoForDefault(String myDefault){
if(myDefault == null){
return null;
}
TargetInfo info = null;
for(int i=0;i
String disPackageName = mDisplayList.get(i).getResolveInfo().activityInfo.applicationInfo.packageName;
if(myDefault.equals(disPackageName) ){
info = mDisplayList.get(i);
break;
}
}
return info;
}
ult.equals(disPackageName) ){
info = mDisplayList.get(i);
break;
}
}
return info;
}
