在使用debug看获取到的Intent内容时，显示的是如下内容：
| Intent { act=android.intent.action.VIEW dat=#Intent;action=com.ting.testAction;S.package_name=com.ting.testPackage;S.method_name=testMethod;S.params={"intent":" flg=0x10020000 pkg=com.ting.test cmp=com.ting.test/.CodeTestActivity (has extras) } |
注意：红色字体显示的是Intent的data的内容，因为是用的debug，没有显示全。
如此显示，是使用了Intent的toString方法。下面让我们一点一点跟进。
@Override public String toString() { StringBuilder b = new StringBuilder(128); b.append("Intent { "); toShortString(b, true, true, true, false); b.append(" }"); return b.toString(); } Intent的toString方法中使用了toShortString，跟进。
/** @hide */ public void toShortString(StringBuilder b, boolean secure, boolean comp, boolean extras, boolean clip) { boolean first = true; if (mAction != null) { b.append("act=").append(mAction); first = false; } if (mCategories != null) { if (!first) { b.append(' '); } first = false; b.append("cat=["); for (int i=0; i 0) b.append(','); b.append(mCategories.valueAt(i)); } b.append("]"); } if (mData != null) { if (!first) { b.append(' '); } first = false; b.append("dat="); if (secure) { b.append(mData.toSafeString()); } else { b.append(mData); } } if (mType != null) { if (!first) { b.append(' '); } first = false; b.append("typ=").append(mType); } if (mFlags != 0) { if (!first) { b.append(' '); } first = false; b.append("flg=0x").append(Integer.toHexString(mFlags)); } if (mPackage != null) { if (!first) { b.append(' '); } first = false; b.append("pkg=").append(mPackage); } if (comp && mComponent != null) { if (!first) { b.append(' '); } first = false; b.append("cmp=").append(mComponent.flattenToShortString()); } if (mSourceBounds != null) { if (!first) { b.append(' '); } first = false; b.append("bnds=").append(mSourceBounds.toShortString()); } if (mClipData != null) { if (!first) { b.append(' '); } b.append("clip={"); if (clip) { mClipData.toShortString(b); } else { if (mClipData.getDescription() != null) { first = !mClipData.getDescription().toShortStringTypesOnly(b); } else { first = true; } mClipData.toShortStringShortItems(b, first); } first = false; b.append('}'); } if (extras && mExtras != null) { if (!first) { b.append(' '); } first = false; b.append("(has extras)"); } if (mContentUserHint != UserHandle.USER_CURRENT) { if (!first) { b.append(' '); } first = false; b.append("u=").append(mContentUserHint); } if (mSelector != null) { b.append(" sel="); mSelector.toShortString(b, secure, comp, extras, clip); b.append("}"); } } 下面我看下红色的dat=内容。
| Intent { act=android.intent.action.VIEW dat=#Intent;action=com.ting.testAction;S.package_name=com.ting.testPackage;S.method_name=testMethod;S.params={"intent":" flg=0x10020000 pkg=com.ting.test cmp=com.ting.test/.CodeTestActivity (has extras) } |
它其实是把一个Intent转成Uri，传到data中。下面我们来看一下Intent序列化转成Uri的代码。
public String toUri(int flags) { ......//此处省略 toUriFragment(uri, scheme, Intent.ACTION_VIEW, null, flags); return uri.toString(); } Intent的toUri方法中调用到了toUriFragment方法，跟进。
private void toUriFragment(StringBuilder uri, String scheme, String defAction, String defPackage, int flags) { StringBuilder frag = new StringBuilder(128); toUriInner(frag, scheme, defAction, defPackage, flags); if (mSelector != null) { frag.append("SEL;"); // Note that for now we are not going to try to handle the // data part; not clear how to represent this as a URI, and // not much utility in it. mSelector.toUriInner(frag, mSelector.mData != null ? mSelector.mData.getScheme() : null, null, null, flags); } if (frag.length() > 0) { uri.append("#Intent;"); uri.append(frag); uri.append("end"); } } 里面用到了toUriInner方法，跟进。
private void toUriInner(StringBuilder uri, String scheme, String defAction, String defPackage, int flags) { if (scheme != null) { uri.append("scheme=").append(scheme).append(';'); } if (mAction != null && !mAction.equals(defAction)) { uri.append("action=").append(Uri.encode(mAction)).append(';'); } if (mCategories != null) { for (int i=0; i 终于看到全貌了。